View source for Chesapeake Bay

{{Short description|Estuary in the U.S. states of Maryland and Virginia}}
{{Infobox body of water
| name               = Chesapeake Bay
| native_name        = 
| native_name_lang   = 
| other_name         = <!--    Images     -->
| image              = Chesapeakelandsat.jpeg
| alt                = 
| caption            = A satellite image of the Chesapeake Bay
| image_bathymetry   = 
| alt_bathymetry     = 
| caption_bathymetry = <!--    Stats      -->
| location           = [[Maryland]] and [[Virginia]]
| group              = 
| coordinates        = {{coord|37.8|-76.1|region:US-MD_type:waterbody|display =inline,title}}
| type               = Estuary
| etymology          = {{lang|alg|Chesepiooc}}, [[Algonquian languages|Algonquian]] for village 'at a big river'
| part_of            = 
| inflow             = [[Susquehanna River]] mouth<br/>east of [[Havre de Grace, Maryland]]
| rivers             = [[Deer Creek (Maryland)|Deer Creek]],<br />[[Bush River (Maryland)|Bush River]],<br />[[Gunpowder River]],<br /> [[Back River (Virginia)|Back River]],<br />[[Patapsco River]],<br />[[Severn River (Maryland)|Severn River]],<br /> [[Patuxent River]],<br />[[Potomac River]],<br />[[Rappahannock River]],<br />[[York River (Virginia)|York River]],<br />[[James River]], [[Chester River]], [[Choptank River]], [[Nanticoke River]], [[Pocomoke River]]
| outflow            = Atlantic Ocean<br/>north of [[Virginia Beach, Virginia]]<br/>{{coord|36|59|45|N|75|57|34|W|display=inline}}
| oceans             = 
| catchment          = {{convert|64299|sqmi|abbr=on}}
| basin_countries    = United States
| agency             = 
| designation        = 
| date-built         = <!-- {{Start date|YYYY|MM|DD}} For man-made and other recent bodies of water -->
| engineer           = 
| date-flooded       = <!-- {{Start date|YYYY|MM|DD}} For man-made and other recent bodies of water -->
| length             = {{convert|200|mi|abbr=on}}
| width              = {{convert|30|mi|abbr=on}}
| area               = {{convert|4479|sqmi|abbr=on}}
| depth              = {{convert|21|ft|abbr=on}}
| max-depth          = <!-- {{convert|VALUE|UNITS}} must be used -->
| volume             = <!-- {{convert|VALUE|UNITS}} must be used -->
| residence_time     = 180 days{{Refn|group=note|name=residence time range|Residence time ranges from 110 to 264 days with an average of 180 days based on circulation in the years 1980 to 2012.<ref name="Du Shen 2016 pp. 101–111">{{cite journal | last1=Du | first1=Jiabi | last2=Shen | first2=Jian | title=Water residence time in Chesapeake Bay for 1980–2012 | journal=Journal of Marine Systems | publisher=Elsevier BV | volume=164 | year=2016 | issn=0924-7963 | doi=10.1016/j.jmarsys.2016.08.011 | pages=101–111| bibcode=2016JMS...164..101D | doi-access=free }}</ref>}}
| salinity           = 
| shore              = <!-- {{convert|VALUE|UNITS}} must be used -->
| elevation          = <!-- {{convert|VALUE|UNITS}} must be used -->
| temperature_high   = <!-- {{convert|VALUE|UNITS}} must be used -->
| temperature_low    = <!-- {{convert|VALUE|UNITS}} must be used -->
| frozen             = 
| islands            = 
| islands_category   = 
| sections           = 
| trenches           = 
| benches            = 
| cities             = <!--      Map      -->
[[Annapolis]], [[Baltimore]], [[Cambridge, Maryland|Cambridge]], [[Cape Charles, Virginia|Cape Charles]], [[Chesapeake, Virginia|Chesapeake]], [[Chesapeake Beach, Maryland|Chesapeake Beach]], [[Elkton, Maryland|Elkton]], [[Hampton, Virginia|Hampton]], [[Havre de Grace, Maryland|Havre de Grace]], [[Newport News]], [[Norfolk, Virginia|Norfolk]], [[Portsmouth, Virginia|Portsmouth]], [[Virginia Beach]]
| image_map          = Chesapeakewatershedmap.png
| caption_map        = The Chesapeake Bay drainage basin extends into six states, [[Maryland]], [[Virginia]], [[West Virginia]], [[Delaware]], [[Pennsylvania]], and [[New York (state)|New York]], and the federal capital of [[Washington, D.C.]]
| pushpin_map        = Virginia
<!--   Below       -->| website            = 
| reference          = {{Designation list
| embed = yes
| designation1 = Ramsar
| designation1_offname = Chesapeake Bay Estuarine Complex
| designation1_date = 4 June 1987
| designation1_number = 375<ref>{{Cite web|title=Chesapeake Bay Estuarine Complex|website=[[Ramsar Convention|Ramsar]] Sites Information Service|url=https://rsis.ramsar.org/ris/375|access-date=25 April 2018}}</ref>}}
}}
The '''Chesapeake Bay''' ({{IPAc-en|ˈ|tʃ|ɛ|s|ə|p|iː|k}} {{respell|CHESS|ə-peek}}) is the largest [[estuary]] in the United States. The bay is located in the [[Mid-Atlantic (United States)|Mid-Atlantic region]] and is primarily separated from the [[Atlantic Ocean]] by the [[Delmarva Peninsula]], including parts of the [[Eastern Shore of Maryland]], the [[Eastern Shore of Virginia]], and the state of [[Delaware]]. The mouth of the bay at its southern point is located between [[Cape Henry]] and [[Cape Charles (headland)|Cape Charles]].<ref name=twsT16>{{cite news |first=Leslie |last=Kaufman |title=More Blue Crabs, but Chesapeake Bay Is Still at Risk, Report Says |newspaper=The New York Times |date= December 28, 2010 |url=http://green.blogs.nytimes.com/2010/12/28/more-blue-crabs-but-chesapeake-bay-still-is-at-risk-report-says/ |access-date= 2011-04-20 |archive-url= https://web.archive.org/web/20110412144707/http://green.blogs.nytimes.com/2010/12/28/more-blue-crabs-but-chesapeake-bay-still-is-at-risk-report-says/ |archive-date= April 12, 2011 }}</ref> With its northern portion in [[Maryland]] and the southern part in [[Virginia]], the Chesapeake Bay is a very important feature for the ecology and economy of those two states, as well as others surrounding within its watershed. More than 150 major rivers and streams flow into the bay's {{convert|64299|sqmi|km2|0|adj=on}} [[drainage basin]], which covers parts of six states ([[New York (state)|New York]], [[Pennsylvania]], [[Delaware]], Maryland, Virginia, and [[West Virginia]]) and all of [[Washington, D.C.]]<ref name=twsT16/><ref name="fs102-98">{{cite web |url=https://pubs.usgs.gov/fs/fs102-98/ |title=Fact Sheet 102–98 – The Chesapeake Bay: Geologic Product of Rising Sea Level |publisher=U. S. Geological Survey (USGS) |date=1998-11-18 |access-date=2008-01-13}}</ref>

The bay is approximately {{convert|200|mi|km}} long from its northern headwaters in the [[Susquehanna River]] to its outlet in the Atlantic Ocean. It is {{convert|2.8|mi|km}} wide at its narrowest (between [[Kent County, Maryland|Kent County's]] Plum Point near Newtown in the east and the [[Harford County, Maryland|Harford County]] western shore near Romney Creek) and {{convert|30|mi|km}} at its widest (just south of the mouth of the [[Potomac River]], which divides Maryland from Virginia). Total shoreline including tributaries is {{convert|11684|mi|km}}, circumnavigating a surface area of {{convert|4479|sqmi|km2|0}}. Average depth is {{convert|21|ft|m}}, reaching a maximum of {{convert|174|ft|m}}.<ref name="297bathysurveys">{{cite web |url=https://catalog.data.gov/dataset/chesapeake-bay-va-md-m130-bathymetric-digital-elevationmodel-30-meter-resolution-derived-from-s |title=Chesapeake Bay, VA/MD (M130) Bathymetric Digital ElevationModel (30 meter resolution) Derived From Source Hydrographic Survey Soundings Collected by NOAA |publisher=[[National Oceanic and Atmospheric Administration]] |date=2013-05-17 |access-date=2015-01-21 |archive-url=http://webarchive.loc.gov/all/20150411050717/http://catalog.data.gov/dataset/chesapeake-bay-va-md-m130-bathymetric-digital-elevationmodel-30-meter-resolution-derived-from-s |archive-date=2015-04-11 }}</ref> The bay is spanned twice, in Maryland by the [[Chesapeake Bay Bridge]] from [[Sandy Point State Park|Sandy Point]] (near [[Annapolis]]) to [[Kent Island, Maryland|Kent Island]] and in Virginia by the [[Chesapeake Bay Bridge–Tunnel]] connecting [[Virginia Beach, Virginia|Virginia Beach]] to [[Cape Charles, Virginia|Cape Charles]].

Known for both its beauty and bounty, the bay has become "emptier", with fewer crabs, [[oysters]] and [[waterman (occupation)|watermen]] (fishermen) since the mid-20th century.<ref name=twsT13>{{cite news |first=David A. |last=Fahrenthold |title=Way of Life Slipping Away Along Chesapeake's Edge |newspaper=The Washington Post|date=2008-12-28 |url= https://www.washingtonpost.com/wp-dyn/content/article/2008/12/27/AR2008122701126.html |access-date=2011-04-20}}</ref> [[Nutrient pollution]] and [[urban runoff]] have been identified as major components of impaired water quality in the bay, stressing ecosystems and compounding the decline of shellfish due to [[Overexploitation|overharvesting]]. Restoration efforts that began in the 1990s have continued into the 21st century and show potential for growth of the native oyster population.<ref name="WashPost 2013-11-19">{{cite news |url=https://www.washingtonpost.com/national/health-science/in-the-chesapeake-bay-signs-of-an-oyster-comeback/2013/11/19/58bf61b6-5153-11e3-9fe0-fd2ca728e67c_graphic.html |title=Signs of a Chesapeake Bay oyster comeback |date=19 November 2013 |newspaper=The Washington Post}}</ref><ref name="ABCNews 2015-02-01">{{cite news |url=http://www.abc2news.com/news/region/eastern-shore/maryland-oysters-making-a-comeback |title=Maryland oysters making a comeback |first=Brian |last=Kuebler |date=2015-02-01 |publisher=ABC News|location=United States |archive-url=https://web.archive.org/web/20150402105443/http://www.abc2news.com/news/region/eastern-shore/maryland-oysters-making-a-comeback |archive-date=2 April 2015}}</ref> The health of the Chesapeake Bay improved in 2015, marking three years of gains over a four-year period.<ref name="Cox 2016">{{cite web |last=Cox |first=Jeremy |url=http://www.delmarvanow.com/story/news/2016/05/18/report-chesapeake-bay-healthiest-level-years/84540842/ |date=2016-05-18 |title=Report: Chesapeake Bay at healthiest level in years |work=Delmarva Now |publisher=Gannett}}</ref> Slight improvements in water quality were observed in 2021, compared to indicators measured in 2020.<ref name="Lai 2021">{{cite news |last=Lai |first=Stephanie |title=The Chesapeake Bay's water quality is inching in the right direction, scientists say |url=https://www.washingtonpost.com/local/maryland-news/chesapeake-bay-report-card-2021/2021/06/22/c7ca8122-d34f-11eb-ae54-515e2f63d37d_story.html |date=2021-06-22 |newspaper=The Washington Post}}</ref> The bay is experiencing other environmental concerns, including [[climate change]], which is causing [[sea level rise]] that erodes coastal areas and infrastructure and changes the marine ecosystem.<ref name="Climate-CBP">{{Cite web |title=Climate Change |url=https://www.chesapeakebay.net/issues/climate_change |access-date=2020-12-16 |publisher=Chesapeake Bay Program |location=Annapolis, MD |archive-date=2020-12-18 |archive-url=https://web.archive.org/web/20201218145232/https://www.chesapeakebay.net/issues/climate_change }}</ref>

==Etymology==
The word {{lang|alg|Chesepiooc}} is an [[Algonquian languages|Algonquian]] word referring to a village 'at a big river'. It is the seventh-oldest surviving English placename in the United States, first applied as ''Chesepiook'' by explorers heading north from the [[Roanoke Colony]] into a Chesapeake tributary in 1585 or 1586. The name may also refer to the [[Chesapeake people]] or the Chesepian, a Native American tribe who inhabited the area now known as South [[Hampton Roads]] in the U.S. state of Virginia. They occupied an area that is now the Norfolk, Portsmouth, Chesapeake, and Virginia Beach areas.<ref>Also shown as ''Chisupioc'' (by [[John Smith of Jamestown|John Smith]]) and ''Chisapeack'', in Algonquian {{lang|alg|che}} means 'big' or 'great', {{lang|alg|sepi}} means river, and the {{lang|alg|oc}} or {{lang|alg|ok}} ending indicated something (a village, in this case) 'at' that feature.  {{lang|alg|Sepi}} is also found in another placename of [[Algonquian languages|Algonquian]] origin, [[Mississippi River|Mississippi]]. The name was soon transferred by the English from the big river and the village at that site to the entire bay. {{cite book |title=Names on the Land: A Historical Account of Place-Naming in the United States |url=https://archive.org/details/namesofland0000unse |url-access=registration |last=Stewart |first=George |author-link=George R. Stewart |year=1945 |publisher=Random House |location=New York |page=[https://archive.org/details/namesofland0000unse/page/23 23] }}</ref> In 2005, Algonquian linguist [[Blair Rudes]] "helped to dispel one of the area's most widely held beliefs: that 'Chesapeake' means something like 'great shellfish bay'. It does not, Rudes said. The name might have actually meant something like 'great water', or it might have just referred to a village location at the bay's mouth."<ref>{{cite news |title=A Dead Indian Language Is Brought Back to Life |last=Farenthold |first=David A. |newspaper=The Washington Post|date=2006-12-12 |page=A1 |url=https://www.washingtonpost.com/wp-dyn/content/article/2006/12/11/AR2006121101474_2.html |access-date=2007-03-19 }}</ref>

The first European name for the bay was "Bahia de Santa Maria" (St. Mary's bay). This name was coined by the Spanish.<ref>{{Cite web |title=The Spanish at Ajacan |url=http://virginiaplaces.org/settleland/ajacan.html |access-date=2025-07-15 |website=virginiaplaces.org}}</ref>

==Physical geography==
===Geology and formation===
[[File:Chesapeake Crater boundaries map.png|thumb|Boundaries of the [[Chesapeake Bay impact crater]].]]
The Chesapeake Bay is an [[estuary]] to the North Atlantic, lying between the [[Delmarva Peninsula]] to the east and the North American mainland to the west. It is the ''[[ria]]'', or drowned valley, of the [[Susquehanna River]], meaning that it was the alluvial plain where the river flowed when the sea level was lower. It is not a ''[[fjord]]'', because the [[Laurentide Ice Sheet]] never reached as far south as the northernmost point on the bay. North of [[Baltimore]], the western shore borders the hilly [[Piedmont (United States)|Piedmont]] region of Maryland; south of the city the bay lies within the state's low-lying [[Atlantic coastal plain|coastal plain]], with sedimentary cliffs to the west, and flat islands, winding creeks and marshes to the east. The large rivers entering the bay from the west have broad mouths and are extensions of the main ria for miles up the course of each river.

The bay's geology, its present form, and its very location were created by a [[bolide]] [[impact event]] at the end of the [[Eocene]] (about 35.5 million years ago), forming the [[Chesapeake Bay impact crater]] and much later the Susquehanna River valley. The bay was formed starting about 10,000 years ago when rising sea levels at the end of the last ice age flooded the Susquehanna River valley.<ref name="fs102-98"/> Parts of the bay, especially the [[Calvert County, Maryland]], coastline, are lined by cliffs composed of deposits from receding waters millions of years ago. These cliffs, generally known as [[Calvert Cliffs State Park|Calvert Cliffs]], are famous for their [[fossil]]s, especially fossilized shark teeth, which are commonly found washed up on the beaches next to the cliffs. [[Scientists' Cliffs]] is a beach community in Calvert County named for the desire to create a retreat for scientists when the community was founded in 1935.<ref>{{cite web|url=http://www.scientistscliffs.org/HTML/FAQs/FAQs.htm |title=FAQ |publisher=Scientists Cliffs community |access-date=2008-05-08 |archive-url=https://web.archive.org/web/20090107050207/http://www.scientistscliffs.org/HTML/FAQs/FAQs.htm |archive-date=January 7, 2009 }}</ref>

===Hydrology===
[[File:Sunset - Eastern Bay 5.jpg|thumb|View of the eastern bay in Maryland at sunset]]
[[File:Annapolis, Maryland, Usa P1010854.jpg|thumb|The [[Chesapeake Bay Bridge]], near Annapolis, Maryland]]
Much of the bay is shallow. At the point where the Susquehanna River flows into the bay, the average depth is {{convert|30|ft|m|0|}}, although this soon diminishes to an average of {{convert|10|ft|m|0}} southeast of the city of [[Havre de Grace, Maryland]], to about {{convert|35|ft|m|0}} just north of Annapolis. On average, the depth of the bay is {{convert|21|ft|m}}, including tributaries;<ref>{{cite web |url=http://www.cbf.org/site/PageServer?pagename=exp_sub_watershed_geography |title=Geography |publisher=Chesapeake Bay Foundation |access-date=2008-04-21 |archive-url=https://web.archive.org/web/20071014181514/http://www.cbf.org/site/PageServer?pagename=exp_sub_watershed_geography |archive-date=October 14, 2007 }} Other sources give values of 25 feet (e.g. {{cite web |url=http://www.msa.md.gov/msa/speccol/sc2200/sc2269/html/chartfront.html |title=Charting the Chesapeake 1590–1990 |publisher=Maryland State Archives |access-date=2008-04-21 |archive-date=2021-02-15 |archive-url=https://web.archive.org/web/20210215094045/https://msa.maryland.gov/msa/speccol/sc2200/sc2269/html/chartfront.html }}) or {{convert|30|ft|m}} deep ({{cite web |url=http://ian.umces.edu/pdfs/iannewsletter1.pdf |title=Healthy Chesapeake Waterways |publisher=University of Maryland Center for Environmental Science |access-date=2008-04-21 |archive-url=https://web.archive.org/web/20080626004705/http://ian.umces.edu/pdfs/iannewsletter1.pdf |archive-date=2008-06-26 }})</ref> over 24 percent of the bay is less than {{convert|6|ft|m|0|abbr=on}} deep.<ref name="Chesapeake Bay Program: A Watershed Partnership: Facts & Figures">{{cite web |url=http://www.chesapeakebay.net/factsandfigures.aspx?menuitem=14582 |title=Chesapeake Bay Program: A Watershed Partnership: Facts & Figures |publisher=Chesapeake Bay Program Office |date=2010-05-04 |access-date=2010-10-29 |archive-url=https://web.archive.org/web/20101204081804/http://www.chesapeakebay.net/factsandfigures.aspx?menuitem=14582 |archive-date=2010-12-04 }}</ref>

Because the bay is an estuary, it has fresh water, salt water and [[brackish]] water. Brackish water has three [[salinity]] zones: oligohaline, mesohaline, and [[polyhaline]]. The freshwater zone runs from the mouth of the Susquehanna River to north [[Baltimore]]. The oligohaline zone has very little salt. Salinity varies from 0.5&nbsp;[[Concentration#"Parts-per" notation|ppt]] (parts per thousand) to 10&nbsp;ppt, and freshwater species can survive there. The north end of the oligohaline zone is north Baltimore and the south end is the Chesapeake Bay Bridge. The mesohaline zone has a medium amount of salt and runs from the Bay Bridge to the mouth of the [[Rappahannock River]]. Salinity there ranges from 1.07% to 1.8%. The polyhaline zone is the saltiest zone, and some of the water can be as salty as sea water. It runs from the mouth of the Rappahannock River to the mouth of the bay. The salinity ranges from 1.87% to 3.6%. (3.6% is as salty as the ocean.)<ref>{{cite web |url=https://www.researchgate.net/figure/232679222_fig1_Figure-1-Map-of-Chesapeake-Bay-and-salinity-zones-Salinity-zones-based-on-Chesapeake |title=Figure 1. Map of the Chesapeake Bay and salinity zones. Salinity zones... |website=ResearchGate }}</ref>

The climate of the area surrounding the bay is primarily [[humid subtropical]], with hot, very humid summers and cold to mild winters. Only the area around the mouth of the Susquehanna River is continental in nature, and the mouth of the Susquehanna River and the Susquehanna [[mudflat|flats]] often freeze in winter. It is rare for the surface of the bay to freeze in winter, something that happened most recently in the winter of 1976–77.<ref>{{Cite magazine |magazine=Time |title=The Big Freeze |date=1977-01-31 |url=http://www.time.com/time/magazine/article/0,9171,918620-2,00.html |archive-url=https://web.archive.org/web/20080308235254/http://www.time.com/time/magazine/article/0,9171,918620-2,00.html |archive-date=March 8, 2008 |access-date=2007-03-19 }}</ref>

The Chesapeake Bay is the end point of over 150 rivers and streams.<ref>{{cite web |title=Facts & Figures |url=https://www.chesapeakebay.net/discover/facts |access-date=18 August 2021 |publisher=Chesapeake Bay Program}}</ref> The largest rivers flowing directly into the bay, in order of discharge,<ref>{{cite journal |last1=Zhang |first1=Qian |last2=Brady |first2=Damien C. |last3=Boynton |first3=Walter R. |last4=Ball |first4=William P. |title=Long-term trends of nutrients and sediment from the nontidal Chesapeake watershed: An assessment of progress by river and season |journal=Journal of the American Water Resources Association |date=2015 |volume=51 |issue=6 |pages=1534–1555 |doi=10.1111/1752-1688.12327|bibcode=2015JAWRA..51.1534Z |s2cid=129432081 }}</ref><ref>{{cite report |last1=Sprague |first1=Lori A. |last2=Langland |first2=Michael J. |last3=Yochum |first3=Steven E. |last4=Edwards |first4=Robert E. |last5=Blomquist |first5=Joel D. |last6=Phillips |first6=Scott W. |last7=Shenk |first7=Gary W. |last8=Preston |first8=Stephen D. |title=Factors Affecting Nutrient Trends in Major Rivers of the Chesapeake Bay Watershed. |publisher=USGS |id=Water Resources Investigations Report 00-4218 |date=2000 |url=https://va.water.usgs.gov/online_pubs/WRIR/00-4218.htm |archive-date=2021-10-23 |access-date=2021-08-18 |archive-url=https://web.archive.org/web/20211023090643/https://va.water.usgs.gov/online_pubs/WRIR/00-4218.htm }}</ref> are the [[Susquehanna River]], [[Potomac River]], [[James River]], [[Rappahannock River]], [[York River (Virginia)|York River]], [[Patuxent River]], and [[Choptank River]].

For more information on Chesapeake Bay rivers, see the [[List of Chesapeake Bay rivers]].

[[File: Chesapeake Bay from airplane.jpg|thumb|The bay viewed from a plane]]

==Flora and fauna==
[[File:Chesapeake Waterbird Food Web.jpg|thumb|right|[[Food chain]] diagram for waterbirds of the Chesapeake Bay]]
The Chesapeake Bay is home to numerous fauna that either migrate to the bay at some point during the year or live there year-round. There are over 300 species of fish and numerous [[shellfish]] and crab species. Some of these include the [[Atlantic menhaden]], [[striped bass]], [[American eel]], [[eastern oyster]], [[Atlantic horseshoe crab]], and the [[Callinectes sapidus|blue crab]].<ref>{{cite book |title=A Comprehensive List of Chesapeake Bay Basin Species |date=2007 |publisher=Chesapeake Bay Program |url=https://purl.fdlp.gov/GPO/gpo61614 |access-date=11 October 2015}}</ref>

Birds include [[osprey]]s, [[great blue heron]]s, [[bald eagle]]s,<ref name=twsT18>{{cite news |author=Elton Dunn, Demand Media |title=Chesapeake Bay Kayak Tours |newspaper=USA Today |date=2011-04-20 |url=http://traveltips.usatoday.com/chesapeake-bay-kayak-tours-2207.html |access-date=2011-04-20 |archive-date=2023-06-01 |archive-url=https://web.archive.org/web/20230601102801/https://traveltips.usatoday.com/chesapeake-bay-kayak-tours-2207.html }}</ref> and [[peregrine falcon]]s, the last two of which were threatened by [[DDT]]; their numbers plummeted but have risen in recent years.<ref name=ESAC>{{cite journal |last=Blankenship |first=Karl |date=September 1995 |title=Endangered Species Around the Chesapeake |volume=5 |issue=6 |url=http://www.bayjournal.com/article.cfm?article=916 |journal=Chesapeake Bay Journal |access-date=2011-04-02 |archive-url=https://web.archive.org/web/20110623020828/http://bayjournal.com/article.cfm?article=916 |archive-date=2011-06-23 }}</ref> The [[piping plover]] is a [[near threatened]] species that inhabits the wetlands.<ref name=ESAC/>

Larger fish such as [[Atlantic sturgeon]],<ref>{{cite web |url=http://www.chesapeakebay.net/fieldguide/critter/atlantic_sturgeon |title=Atlantic Sturgeon |publisher=Chesapeake Bay Program |access-date=December 21, 2014 |archive-date=November 8, 2014 |archive-url=https://web.archive.org/web/20141108034822/http://www.chesapeakebay.net/fieldguide/critter/atlantic_sturgeon }}</ref> varieties of sharks,<ref>The Chesapeake Bay News. 2010. [http://www.chesapeakebay.net/blog/post/are_there_sharks_in_the_chesapeake_bay Are there sharks in the Chesapeake Bay?]. Retrieved on December 21. 2014</ref><ref>{{cite news |last=Shinkman |first=D.P. |url=http://wtop.com/news/2012/08/sharks-in-the-chesapeake-more-likely-than-thought/slide/1/ |title=Sharks in the Chesapeake: More likely than thought |archive-url=https://web.archive.org/web/20141220224520/http://wtop.com/news/2012/08/sharks-in-the-chesapeake-more-likely-than-thought/slide/1/ |archive-date=2014-12-20 |publisher=[[WTOP-FM]] Radio |location=Washington, D.C.}}</ref> and [[stingray]]s visit the bay.<ref name=LifeInTheChesapeakeBay /> The waters of the Chesapeake Bay have been regarded as one of the most important nursery areas for sharks along the east coast.<ref name=TNA>The National Aquarium. [http://www.aqua.org/care/a-blue-view/14-10-21-sharks-among-us Sharks Among Us: Chesapeake Bay Species] {{webarchive|url=https://web.archive.org/web/20141024192911/http://www.aqua.org/care/a-blue-view/14-10-21-sharks-among-us |date=2014-10-24 }}. Retrieved on December 22. 2014</ref> [[Megafauna]]s such as [[bull shark]]s, [[tiger shark]]s, [[scalloped hammerhead shark]]s, and [[basking shark]]s<ref name=TNA /> and [[manta ray]]s are also known to visit. Smaller species of sharks and stingrays that are known to be regular to occasional residents in the bay include the [[smooth dogfish]], [[spiny dogfish]], [[cownose ray]], and [[bonnethead]].

[[Bottlenose dolphin]]s are known to live seasonally/yearly in the bay.<ref>{{cite web |url=http://www.chesapeakebay.net/fieldguide/critter/bottlenose_dolphin |title=Bottlenose Dolphin |publisher=Chesapeake Bay Program |access-date=December 21, 2014 |archive-date=December 21, 2014 |archive-url=https://web.archive.org/web/20141221184415/http://www.chesapeakebay.net/fieldguide/critter/bottlenose_dolphin }}</ref> There have been unconfirmed sightings of [[humpback whale]]s in recent years.<ref>{{cite news |last=O'Brien |first=D. |date=1992 |url=https://www.baltimoresun.com/1992/03/15/whale-in-chesapeake-provides-reminders-about-nature/ |title=Whale in Chesapeake Provides Reminders About Nature |newspaper=The Baltimore Sun |access-date=December 21, 2014}}</ref><ref>The Southside Sentinel. 2010. [http://www.ssentinel.com/index.php/community/article/whale_sighted_in_the_chesapeake_bay/ Whale sighted in the Chesapeake Bay] {{Webarchive|url=https://web.archive.org/web/20141220230629/http://www.ssentinel.com/index.php/community/article/whale_sighted_in_the_chesapeake_bay/ |date=2014-12-20 }}. Retrieved on December 21. 2014</ref> Endangered [[North Atlantic right whale]]<ref>[[National Oceanic and Atmospheric Administration]]. 2010. [http://www.noaanews.noaa.gov/stories2010/20101101_shipstrike.html NOAA: Ship Speed Restrictions to Protect Endangered North Atlantic Right Whales]. Retrieved on December 22. 2014</ref> and [[fin whale|fin]], and [[Minke whale|minke]] and [[sei whale|sei]] whales have also been sighted within and in the vicinity of the bay.<ref name=LifeInTheChesapeakeBay />

A male [[manatee]] visited the bay several times between 1994 and 2011, even though the area is north of the species' normal range. The manatee, recognizable due to distinct markings on its body, was nicknamed "Chessie" after a [[Chessie (sea monster)|legendary sea monster]] that was allegedly sighted in the bay during the 20th century.<ref>{{cite web |url=http://www.chesapeakebay.net/blog/post/four_rare_chesapeake_bay_oddities_to_learn_about_this_leap_year |title=Four rare Chesapeake Bay "oddities" to learn about this leap year |publisher=Chesapeake Bay Program |date=February 27, 2012 |access-date=December 21, 2014}}</ref><ref>{{cite web |url=https://www.baltimoresun.com/news/bs-xpm-2011-07-15-bs-gr-manatee-20110715-story.html |title=Chessie the manatee is back in the Bay |newspaper=The Baltimore Sun |date=July 15, 2011 |author1=Kilar, Steve |author2=Wheeler, Timothy B. |access-date=January 29, 2017 |archive-date=September 23, 2016 |archive-url=https://web.archive.org/web/20160923190436/http://articles.baltimoresun.com/2011-07-15/features/bs-gr-manatee-20110715_1_manatee-beck-usgs |url-status=live }}</ref><ref>{{cite web |url=https://soundwaves.usgs.gov/2011/10/fieldwork5.html |title=Famous Manatee "Chessie" Sighted in Chesapeake Bay After Long Absence |work=Sound Waves |publisher=USGS |date=September 2011 |author1=Beck, Cathy |author2=Pawlitz, Rachel |author3=Bloomer, Jen |access-date=January 29, 2017 |archive-date=November 4, 2017 |archive-url=https://web.archive.org/web/20171104062319/https://soundwaves.usgs.gov/2011/10/fieldwork5.html }}</ref> The same manatee has been spotted as far north as [[Rhode Island]], and was the first manatee known to travel so far north.<ref>{{cite web |url=https://soundwaves.usgs.gov/2006/09/research2.html |title=Manatee Traveler in Northeastern Waters Not Chessie |work=Sound Waves |publisher=USGS |date=September 2006 |author1=Hamilton, Hannah |author2=Puckett, Catherine |access-date=January 29, 2017 |archive-date=February 2, 2017 |archive-url=https://web.archive.org/web/20170202054640/https://soundwaves.usgs.gov/2006/09/research2.html }}</ref> Other manatees are occasionally seen in the bay and its tributaries, which contain sea grasses that are part of the manatee's diet.<ref>{{cite web |url=https://www.washingtonpost.com/news/local/wp/2015/07/16/manatee-spotted-in-tributary-off-chesapeake-bay-near-waldorf-md/ |title=Manatee spotted in tributary off Chesapeake Bay near Waldorf, Md. |newspaper=The Washington Post|date=July 16, 2015 |author=Hedgpeth, Dana |access-date=January 29, 2017}}</ref>

[[Loggerhead turtle]]s are known to visit the bay.<ref name=LifeInTheChesapeakeBay>{{citation|author1=Lippson J.A. |author2=Lippson L.R. |year=2006 |title=Life in the Chesapeake Bay |url=https://books.google.com/books?id=BhCbWmyKrZcC&q=chesapeake%20bay%20whale&pg=PA280 |pages=275–281 |publisher=Johns Hopkins University Press |access-date=2014-12-21 |isbn=978-0-8018-8338-5 }}{{dead link|date=March 2018|bot=medic}}{{cbignore|bot=medic}}</ref>

The Chesapeake Bay is also home to a diverse flora, both land and aquatic. Common [[submerged aquatic vegetation]] includes [[Zostera|eelgrass]] and [[Ruppia maritima|widgeon grass]]. A report in 2011 suggested that information on underwater grasses would be released, because "submerged grasses provide food and habitat for a number of species, adding oxygen to the water and improving water clarity."<ref name=twsT31>{{cite news |agency=Associated Press |title=Chesapeake Bay Program to release new data on underwater grasses in bay, rivers |newspaper=The Washington Post|date=April 20, 2011 |url= https://www.washingtonpost.com/national/chesapeake-bay-program-to-release-new-data-on-underwater-grasses-in-bay-rivers/2011/04/20/AFDaghAE_story.html |access-date= 2011-04-20}}{{dead link|date=June 2021|bot=medic}}{{cbignore|bot=medic}}</ref> Other vegetation that makes its home in other parts of the bay are [[wild rice]], various trees like the [[red maple]], [[Pinus taeda|loblolly pine]] and [[bald cypress]], and [[spartina]] grass and [[phragmites]].<ref>Domes S., Lewis M., Moran R., Nyman D.. "Chesapeake Bay Wetlands". Emporia State University. May 2009. Retrieved 2010-03-14.</ref> [[Invasive species|Invasive plants]] have taken a significant foothold in the bay. Plants such as Phragmites, Purple loosestrife and Japanese stiltgrass have established high levels of permanency in Chesapeake wetlands.<ref>{{Cite web |title=Wetlands |url=https://www.chesapeakebay.net/issues/whats-at-risk/wetlands |access-date=2024-04-09 |website=Chesapeake Bay |language=en-US}}</ref> Additionally, plants such as [[Egeria densa|Brazilian waterweed]], native to South America, have spread to most continents with the help of aquarium owners, who often dump the contents of their aquariums into nearby lakes and streams. It is highly invasive and has the potential to flourish in the low-salinity tidal waters of the bay. Dense stands of Brazilian waterweed can restrict water movement, trap sediment and affect water quality. Various local K-12 schools in the Maryland and Virginia region often have programs that cultivate native bay grasses and plant them in the bay.{{Citation needed|date=April 2024}}

==History==
===Pre-Columbian===
It is presumed that the Chesapeake Bay was once inhabited by Paleoindians 11,000 years ago.<ref>{{cite book |last1=Arnett |first1=Earl |last2=Brugger |first2=Robert J. |last3=Papenfuse |first3=Edward C. |title=Maryland: A New Guide to the Old Line State |date=3 May 1999 |publisher=JHU Press |isbn=978-0-8018-5980-9 |page=128 |url=https://books.google.com/books?id=lncOLHYhcrsC&pg=PA128}}</ref> For thousands of years, Native American societies lived in villages of wooden [[longhouse]]s close to water bodies where they fished and farmed the land. Agricultural products included beans, corn, tobacco, and squash. Villages often lasted between 10 and 20 years before being abandoned due to local resources such as firewood running out or soil depleting.<ref>{{Cite web |title=History & Culture—Chesapeake Bay |url=https://www.nps.gov/locations/chesapeakebaywatershed/index.htm |access-date=2021-03-07 |publisher=National Park Service}}</ref> To produce enough food, labor was divided with men hunting while the women supervised the village's farming. All village members took part in the harvesting of fish and shellfish from the local bodies of water. As time went on, communities around the Chesapeake Bay formed confederations such as the [[Powhatan]], the [[Piscataway people|Piscataway]], and the [[Nanticoke people|Nanticoke]]. Each of these confederations consisted of a collection of smaller tribes falling under the leadership of a central chief.<ref>{{Cite book |last=Tayac |first=Gabrielle |date=2006 |title=We Have A Story To Tell: Native Peoples of the Chesapeake Region; A Guide for Teachers |url=https://archive.org/details/chesapeakenativeamericans |access-date=March 6, 2021 |publisher=National Museum of the American Indian, Smithsonian Institution}}</ref>

===European exploration and settlement===
[[File:First map to label Chesapeake Bay.jpg|thumb|Revised map{{refn|orientation of map depicts west at top}} of [[John White (colonist and artist)|John White's]] original by Theodore DeBry. In this 1590 version, the Chesapeake Bay appears named for the first time.<ref>{{cite book |last1=Woodard |first1=Buck |title=A Study of Virginia Indians and Jamestown: The First Century|date=2006-11-22 |publisher=Colonial National Historical Park, National Park Service |page=Appendix A |url=https://www.nps.gov/parkhistory/online_books/jame1/moretti-langholtz/appendixa2.htm |access-date=9 April 2016}}</ref>]]
[[File:1630 Hondius Map of Virginia and the Chesapeake - Geographicus - NovaVirginiaeTabula-hondius-1630.jpg|thumb|Later (1630) version of the 1612 map by Captain John Smith during his exploration of the Chesapeake. The map is oriented with west at top.]]
In 1524, Italian explorer [[Giovanni da Verrazzano]], (1485–1528), in service of the [[Kingdom of France|French crown]], (famous for sailing through and thereafter naming the entrance to [[New York Bay]] as the "[[The Narrows|Verrazzano Narrows]]", including now in the 20th century, a [[suspension bridge]] also named for [[Verrazano-Narrows Bridge|him]]) sailed past the Chesapeake, but did not enter the bay.<ref name=Parramore>{{cite book |last1=Parramore |first1=Thomas |title=Norfolk: The First Four Centuries | year = 2000 |pages=1–16 |publisher=University of Virginia Press |url=https://books.google.com/books?id=pWiCMTB35mEC |access-date=2011-11-05 |isbn= 978-0-8139-1988-1 }}</ref> Spanish explorer [[Lucas Vásquez de Ayllón]] sent an expedition out from [[Hispaniola]] in 1525 that reached the mouths of the Chesapeake and [[Delaware Bay]]s. It may have been the first European expedition to explore parts of the Chesapeake Bay, which the Spaniards called "Bahía de Santa María" ("Bay of St. Mary") or "Bahía de Madre de Dios."("Bay of the Mother of God")<ref>{{cite web | url=http://www.virginiaplaces.org/settleland/spanish.html |title=Spanish in the Chesapeake |access-date=2010-07-08 |last=Grymes |first=Charles A}}</ref> De Ayllón established a short-lived [[Spain|Spanish]] mission settlement, [[San Miguel de Gualdape]], in 1526 along the [[Atlantic Ocean|Atlantic coast]]. Many scholars doubt the assertion that it was as far north as the Chesapeake; most place it in present-day [[Georgia (U.S. state)|Georgia]]'s [[Sapelo Island]].<ref>{{cite book |title=The Spanish Frontier in North America |last= Weber|first=David |year=1994 |publisher=Yale University Press|location=New Haven, CT |pages=36–37}}</ref> In 1573, [[Pedro Menéndez de Márquez]], the governor of Spanish Florida, conducted further exploration of the Chesapeake.<ref name=Parramore /> In 1570, Spanish [[Jesuits]] established the short-lived [[Ajacan Mission]] on one of the Chesapeake tributaries in present-day Virginia.{{Citation needed|date=December 2022}}

The arrival of English colonists under [[Sir Walter Raleigh]] and [[Humphrey Gilbert]] in the late 16th century to found a colony, later settled at [[Roanoke Island]] (off the present-day coast of [[North Carolina]]) for the [[Virginia Company]], marked the first time that the English approached the gates to the Chesapeake Bay between the capes of [[Cape Charles (headland)|Cape Charles]] and [[Cape Henry]]. Three decades later, in 1607, Europeans again entered the bay. [[Captain John Smith]] of [[Kingdom of England|England]] explored and mapped the bay between 1607 and 1609, resulting in the publication in 1612 back in the [[British Isles]] of ''"A Map of Virginia"''.<ref name=SmithMapinfo>{{cite web |title=Smith's Maps |url=http://www.smithtrail.net/captain-john-smith/smiths-maps/ |work=Captain John Smith Chesapeake National Historical Trail |publisher=National Park Service |access-date=12 June 2012 |archive-date=29 May 2012 |archive-url=https://web.archive.org/web/20120529141445/http://www.smithtrail.net/captain-john-smith/smiths-maps/ }}</ref> Smith wrote in his journal: "Heaven and earth have never agreed better to frame a place for man's habitation."<ref name=twsT21/> The [[Captain John Smith Chesapeake National Historic Trail]], the first designated "all-water" [[National Historic Trail]] in the US, was established in 2006 by the [[National Park Service]]. The trail follows the route of Smith's historic 17th-century voyage.<ref>{{cite web |title=H.R. 5466 <nowiki>[109th]</nowiki> Captain John Smith Chesapeake National Historic Trail Designation Act |url=http://www.govtrack.us/congress/bill.xpd?bill=h109-5466 |publisher=GovTrack.us |access-date=December 16, 2007 |archive-date=November 3, 2011 |archive-url=https://web.archive.org/web/20111103143204/http://www.govtrack.us/congress/bill.xpd?bill=h109-5466 }}</ref> Because of economic hardships and civil strife in the "Mother Land", there was a mass migration of southern English [[Cavalier]]s and their servants to the Chesapeake Bay region between 1640 and 1675, to both of the new colonies of the [[Province of Virginia]] and the [[Province of Maryland]].{{Citation needed|date=December 2022}}

===American Revolution to the present===
[[File:Oyster wars 1886 Harpers Weekly.jpeg|thumb|right|alt=|[[Oyster Wars|Oyster boats at war]] off the Maryland shore (1886 wood engraving). Regulation of the oyster beds in Virginia and Maryland has existed since the 19th century.]]
The Chesapeake Bay was the site of the [[Battle of the Chesapeake]] (also known as the "Battle of the Capes", [[Cape Charles (headland)|Cape Charles]] and [[Cape Henry]]) in 1781, during which the French fleet defeated the [[Royal Navy]] in the decisive naval battle of the [[American Revolutionary War]]. The French victory enabled General [[George Washington]] and his [[Kingdom of France|French]] allies under the [[Jean-Baptiste Donatien de Vimeur, Comte de Rochambeau|Comte de Rochambeau]] to march down from [[History of New York City|New York]] and bottle up a British army under [[Lord Cornwallis]] from the [[North Carolina in the American Revolution|North]] and [[South Carolina in the American Revolution|South]] Carolinas at the siege of [[Siege of Yorktown|Battle of Yorktown]] in [[Yorktown, Virginia]]. Their marching route from [[Newport, Rhode Island]] through Connecticut, New York State, Pennsylvania, New Jersey and Delaware to the [[Elkton, Maryland|"Head of Elk"]] by the [[Susquehanna River]] along the shores and also partially sailing down the bay to [[History of Virginia|Virginia]]. It is also the subject of a designated National Historic Trail as the [[Washington–Rochambeau Revolutionary Route]].{{Citation needed|date=December 2022}}

The bay would again see conflict during [[War of 1812]]. During the year of 1813, from their base on [[Tangier Island]], British naval forces under the command of Admiral [[George Cockburn]] raided several towns on the shores of the Chesapeake, treating the bay as if it were a "British Lake". The [[Chesapeake Bay Flotilla]], a fleet of shallow-draft armed barges under the command of [[United States Navy|U.S. Navy]] Commodore [[Joshua Barney]], was assembled to stall British shore raids and attacks. After months of harassment by Barney, the British landed on the west side of the Patuxent at [[Benedict, Maryland]], the Chesapeake Flotilla was scuttled, and the British trekked overland to [[Battle of Bladensburg|rout the U.S. Army at Bladensburg]] and [[Burning of Washington|burn the U.S. Capitol]] in August 1814. A few days later in a "pincer attack", they also sailed up the Potomac River to attack [[Fort Washington (Maryland)|Fort Washington]] below the National Capital and [[Raid on Alexandria (Virginia)|raided]] the nearby port town of [[Alexandria, Virginia]].{{Citation needed|date=December 2022}}

There were so-called "[[Oyster Wars]]" in the late 19th and early 20th centuries. Until the mid-20th century, oyster harvesting rivaled the crab industry among Chesapeake watermen, a dwindling breed whose [[skipjack (boat)|skipjacks]] and other workboats were supplanted by recreational craft in the latter part of the century.<ref name=twsT22>{{cite news |first=Kendra Bailey |last=Morris |title=Consider the Chesapeake Bay Oyster |publisher=NPR |date= November 21, 2007 |url=https://www.npr.org/templates/story/story.php?storyId=16369187 |access-date=April 20, 2011}}</ref>

In the 1960s, the [[Calvert Cliffs Nuclear Power Plant]] on the historic [[Calvert Cliffs State Park|Calvert Cliffs]] in [[Calvert County, Maryland|Calvert County]] on the Western Shore of Maryland began using water from the bay to cool its reactor.<ref>{{Cite web |last=Patel |first=Sonal |date=2022-11-01 |title=A Half-Century of Reliability: Calvert Cliffs Nuclear Power Plant |url=https://www.powermag.com/a-half-century-of-reliability-calvert-cliffs-nuclear-power-plant/ |access-date=2024-02-24 |website=POWER Magazine |language=en-US}}</ref>

==Navigation==
[[File:Ltshp.JPG|thumb|Lighthouses and [[Lightvessel|lightships]] such as [[United States lightship Chesapeake (LV-116)|''Chesapeake'']] have helped guide ships into the bay.]]
The Chesapeake Bay forms a link in the [[Intracoastal Waterway]], of the bays, sounds and inlets between the off-shore barrier islands and the coastal mainland along the [[Atlantic Ocean|Atlantic coast]] connecting the [[Chesapeake and Delaware Canal]] (linking the bay to the north and the [[Delaware River]]) with the [[Albemarle and Chesapeake Canal]] (linking the bay, to the south, via the [[Elizabeth River (Virginia)|Elizabeth River]], by the cities of [[Norfolk, Virginia|Norfolk]] and [[Portsmouth, Virginia|Portsmouth]] to the [[Albemarle Sound]] and [[Pamlico Sound]] in [[North Carolina]] and further to the Sea Islands of Georgia). A busy shipping channel (dredged by the [[United States Army Corps of Engineers|U.S. Army Corps of Engineers]] since the 1850s) runs the length of the bay, is an important transit route for large vessels entering or leaving the [[Helen Delich Bentley Port of Baltimore|Port of Baltimore]], and further north through the [[Chesapeake and Delaware Canal]] to the ports of [[Wilmington, Delaware|Wilmington]] and [[Philadelphia]] on the [[Delaware River]].

During the later half of the 19th century and the first half of the 20th century, the bay was plied by passenger steamships and packet boat lines connecting the various cities on it, notably the [[Baltimore Steam Packet Company]] ("Old Bay Line").

In the later 20th century, a series of road crossings were built. One, the [[Chesapeake Bay Bridge]] (also known as the Governor William Preston Lane Jr. Memorial Bridge) between the state capital of [[Annapolis, Maryland]] and [[Matapeake, Maryland|Matapeake]] on the [[Eastern Shore of Maryland|Eastern Shore]], crossing [[Kent Island, Maryland|Kent Island]], was constructed 1949–1952. A second, parallel, span was added in 1973. The [[Chesapeake Bay Bridge–Tunnel]], connecting [[Eastern Shore of Virginia|Virginia's Eastern Shore]] with its mainland (at the metropolitan areas of [[Virginia Beach, Virginia|Virginia Beach]], [[Norfolk, Virginia|Norfolk]], [[Portsmouth, Virginia|Portsmouth]], and [[Chesapeake, Virginia|Chesapeake]]), is approximately {{convert|20|mi|km}} long; it has trestle bridges as well as two stretches of {{convert|2|mi|km|adj=mid|-long|spell=in}} tunnels that allow unimpeded shipping; the bridge is supported by four {{convert|5.25|acre|m2|adj=on}} man-made islands. The Chesapeake Bay Bridge[[Chesapeake Bay Bridge–Tunnel|–]]Tunnel was opened for two lanes in 1964 and four lanes in 1999.<ref>{{cite web|url=http://www.cbbt.com/facts.html|title=CBBT Facts|access-date=2015-05-21|archive-url=https://web.archive.org/web/20150428072417/http://www.cbbt.com/facts.html|archive-date=2015-04-28}}</ref><ref name=twsT25>{{cite news |first=J.D. |last=Wollf |title=Fishing at the Chesapeake Bay Bridge Tunnel |newspaper=USA Today |date=April 20, 2011 |url=http://traveltips.usatoday.com/fishing-chesapeake-bay-bridge-tunnel-33269.html |access-date=April 20, 2011 |archive-date=July 23, 2011 |archive-url=https://web.archive.org/web/20110723180104/http://traveltips.usatoday.com/fishing-chesapeake-bay-bridge-tunnel-33269.html }}</ref>

===Tides===
[[File:Tide final4.jpg|thumb|Example Chesapeake Bay tides from Baltimore and the Chesapeake Bay Bridge–Tunnel for quarter and full moons during June 2013]]  
[[Tide]]s in the Chesapeake Bay exhibit an interesting and unique behavior due to the nature of the topography (both horizontal and vertical shape), wind-driven circulation, and how the bay interacts with oceanic tides. Research into the peculiar behavior of tides both at the northern and southern extents of the bay began in the late 1970s. One study noted sea level fluctuations at periods of 5 days, driven by sea level changes at the bay's mouth on the Atlantic coast and local lateral winds, and 2.5 days, caused by resonant oscillations driven by local longitudinal winds,<ref>{{cite journal |last=Wang |first=D-P. |date=1979 |title=Subtidal Sea Level Variations in the Chesapeake Bay and Relations to Atmospheric Forcing |journal=Journal of Physical Oceanography |volume=9 |issue=2 |pages=413–421 |doi=10.1175/1520-0485(1979)009<0413:SSLVIT>2.0.CO;2 |bibcode=1979JPO.....9..413W }}</ref> while another study later found that the geometry of the bay permits for a resonant period of 1.46 days.<ref>{{cite journal |last1=Wang |first1=D-P. |first2=A.J. |last2=Elliott |title=Non-Tidal Variability in the Chesapeake Bay and Potomac River: Evidence for Non-Local Forcing |journal=Journal of Physical Oceanography |date=1978 |volume=8 |issue=2 |pages=225–232 |doi=10.1175/1520-0485(1978)008<0225:NTVITC>2.0.CO;2 |bibcode=1978JPO.....8..225W }}</ref>

A good example of how the different Chesapeake Bay sites experience different tides can be seen in the tidal predictions published by the [[National Oceanographic and Atmospheric Administration]] (NOAA)(''See figure'')

At the Chesapeake Bay Bridge–Tunnel (CBBT) site, which lies at the southernmost point of the bay where it meets the Atlantic Ocean near [[Norfolk, Virginia]], and the capes of [[Cape Charles (headland)|Charles]] and [[Cape Henry|Henry]], there is a distinct semi-diurnal tide throughout the lunar month, with small amplitude modulations during spring (new/full moon) vs. neap (one/three quarter moon) tidal periods. The main forcing of the CBBT tides are typical, semi-diurnal ocean tides that the East Coast of the United States experiences.

Baltimore, in the northern portion of the bay, experiences a noticeable modulation to form its mixed tidal nature during spring vs. neap tides. Spring tides, when the sun-earth-moon system forms a line, cause the largest tidal amplitudes during lunar monthly tidal variations. In contrast, neap tides, when the sun-earth-moon system forms a right angle, are muted, and in a semi-diurnal tidal system (such as that seen at the CBBT site) this can be seen as a lowest intertidal range.

Two interesting points that arise from comparing these two sites at opposite ends of the bay are their tidal characteristics – semi-diurnal tide for CBBT and mixed tide for Baltimore (due to resonance in the bay) – and the differences in amplitude (due to dissipation in the bay).

==Economy ==
===Fishing industry===
[[File:Skipjack EPA.PNG|thumb|A [[Skipjack (boat)|skipjack]], part of the [[oyster#Fishing from the wild|oystering]] fleet in Maryland]]
The bay is well known for its seafood, especially [[Callinectes sapidus|blue crabs]],<ref name=twsT19>{{cite news |first=William |last=Grimes |title=William W. Warner, Chesapeake Bay Author, Dies at 88 |newspaper=The New York Times |date=April 30, 2008 |url=https://www.nytimes.com/2008/04/30/books/30warner.html |access-date=April 20, 2011}}</ref> [[clam]]s, and [[Eastern oyster|oysters]]. In the middle of the 20th century, the bay supported 9,000 full-time watermen, according to one account.<ref name=twsT19/> Today, the body of water is less productive than it used to be because of [[surface runoff|runoff]] from urban areas (mostly on the Western Shore) and farms (especially on the [[Maryland Eastern Shore|Eastern Shore]] and in the Susquehanna River watershed), over-harvesting, and [[invasive species|invasion of foreign species]].

The plentiful oyster harvests led to the development of the [[Skipjack (boat)|skipjack]] (such as the [[Helen Virginia (Skipjack boat)|''Helen Virginia'']]), the state boat of Maryland, which is the only remaining working boat type in the United States still under sail power. Other characteristic bay-area workboats include sail-powered boats such as the [[log canoe]], the [[pungy]], the [[Bugeye (boat)|bugeye]], and the motorized [[Chesapeake Bay deadrise]], the state boat of Virginia.<ref>{{cite web|title=Chesapeake Bay Workboats|url=http://www.baygateways.net/workboats.cfm|publisher=Chesapeake Bay Gateway Network|access-date=2007-03-19|archive-url=https://web.archive.org/web/20070407172549/http://baygateways.net/workboats.cfm|archive-date=2007-04-07}}</ref>

In addition to harvesting wild oysters, [[oyster farming]] is a growing industry in the bay. Oyster aquaculture is passive in that the bay provides all the natural oyster food needed, making it an environmentally friendly practice in contrast to other kinds of fish farming.<ref>{{cite book |last1=Hall |first1=S. J. |last2=Delaporte |first2=A. |last3=Phillips |first3=M. J. |last4=Beveridge |first4=M. |last5=O'Keefe |first5=M. |title=Blue Frontiers: Managing the Environmental Costs of Aquaculture |date=2011 |publisher=The WorldFish Center, Penang, Malaysia |url=https://epub.sub.uni-hamburg.de/epub/volltexte/2013/17704/pdf/WF_2818.pdf}}</ref> Oyster farms provide jobs as well as a natural effort for filtering [[nutrient pollution|excess nutrients]] from the water in an effort to reduce the effects of [[eutrophication]] [[water pollution|pollution]] (too much algae). The [[Chesapeake Bay Program]] promotes oyster restoration projects to reduce the amount of nitrogen compounds entering the bay.<ref>{{cite web |title=Oyster Restoration Projected to Provide Significant Boost to Bay Grasses While Removing Nitrogen Pollution from the Bay |url=http://www.dnr.state.md.us/dnrnews/pressrelease2005/081505.html |archive-url=https://web.archive.org/web/20060903090534/http://www.dnr.state.md.us/dnrnews/pressrelease2005/081505.html |archive-date=2006-09-03 |publisher=Maryland Department of Natural Resources (MDNR) |location=Annapolis, MD}}</ref>

The bay is famous for its rockfish, a regional name for [[striped bass]]. Once on the verge of extinction, rockfish have made a significant comeback because of legislative action that put a moratorium on rockfishing, which allowed the species to re-populate. Rockfish can now be fished in strictly controlled and limited quantities.<ref>{{Cite web |date=2022 |title=Striped Bass Regulations for 2022 |url=https://dnr.maryland.gov/fisheries/documents/StripedBass_regulations2022.pdf |access-date=2023-06-24 |publisher=MDNR}}</ref>

Other popular recreational fisheries in the Chesapeake Bay include [[Shad fishing|shad]],<ref name="Chesapeake Bay Magazine 2018">{{cite web | title=Shad | website=Chesapeake Bay Magazine | date=5 April 2018 | url=https://chesapeakebaymagazine.com/shad/ | access-date=21 October 2021}}</ref> [[cobia]], [[Croaker fish|croaker]], and [[red drum|redfish]], [[winter flounder]], and [[summer flounder]]. Recently, non-native [[blue catfish]] have proliferated in tributaries like the [[James River]] and may be moving to other areas of the bay.<ref name="Nepal Fabrizio p=e0224770">{{cite journal |last1=Nepal |first1=Vaskar |last2=Fabrizio |first2=Mary C. |editor-last=Patterson | editor-first=Heather M. | title=High salinity tolerance of invasive blue catfish suggests potential for further range expansion in the Chesapeake Bay region | journal=PLOS ONE |publisher=Public Library of Science (PLoS) |volume=14 |issue=11 |date=5 November 2019 |issn=1932-6203 |doi=10.1371/journal.pone.0224770 |article-number=e0224770 |pmid=31689331 |pmc=6830772 |bibcode=2019PLoSO..1424770N | doi-access=free }}</ref> A commercial fishery exists for [[Atlantic menhaden|menhaden]], too oily for human consumption but instead used for bait, fish oil, and livestock feed.<ref name="menhaden">{{cite web |title=Atlantic Menhaden |publisher=Chesapeake Bay Program | url=https://www.chesapeakebay.net/discover/field-guide/entry/atlantic_menhaden |access-date=21 October 2021}}</ref>

===Tourism and recreation===
[[File:Thomas Point Lighthouse Chesapeake Bay.jpg|thumb|The [[Thomas Point Shoal Light]] in Maryland]]
[[File:Luxury waterfront townhomes in Maryland .jpeg|right|thumb|As of 2021, the luxury townhomes on Carr's Beach and Sparrow's Beach.]]
<!--alternative[[File:POOLES ISLAND 1 72 500.jpg|thumb|right|alt=|[[Pooles Island Light]]]]-->
[[File:ChesapeakeTidalWetlands.jpg|thumb|Tidal [[wetlands]] of the Chesapeake Bay]]
The Chesapeake Bay is a main feature for tourists who visit Maryland and Virginia each year.<ref>{{Cite web|url=http://mdsg.umd.edu/|title=Maryland Sea Grant|website=Maryland Sea Grant|language=en|access-date=2018-09-12}}</ref> Fishing, crabbing, swimming, boating, kayaking,<ref name=twsT18/> and sailing are extremely popular activities enjoyed on the waters of the Chesapeake Bay. As a result, tourism has a notable impact on Maryland's economy.<ref>{{cite web |author=Harvey M. Katz |url=http://executiveorder.chesapeakebay.net/post/Targeting-Resources-to-Better-Protect-the-Chesapeake-Bay-is-Aim-of-US-Department-of-Agriculture.aspx |title=Chesapeake Bay Executive Order &#124; Targeting Resources to Better Protect the Chesapeake Bay is Aim of U.S. Department of Agriculture's 202(b) Report |publisher=Executiveorder.chesapeakebay.net |date=2009-08-27 |access-date=2014-02-28 |archive-date=2014-03-05 |archive-url=https://web.archive.org/web/20140305050928/http://executiveorder.chesapeakebay.net/post/Targeting-Resources-to-Better-Protect-the-Chesapeake-Bay-is-Aim-of-US-Department-of-Agriculture.aspx }}</ref> One report suggested that Annapolis was an appealing spot for families, water sports and boating.<ref name=twsT24>{{cite news |first=Anne |last=Glusker |title=A Treasure Chest of Fun on Chesapeake Bay |newspaper=The New York Times |date= October 9, 2005 |url= http://travel.nytimes.com/2005/10/09/travel/09kids.html |access-date= 2011-04-20}}</ref> Commentator Terry Smith spoke about the bay's beauty: {{blockquote|The water is glassy, smooth and gorgeous, his wake white against the deep blue. That's the problem with the Chesapeake. It's so damned beautiful.<ref name=twsT21/>}}

One account suggested how the Chesapeake attracts people:
{{blockquote|You see them everywhere on Maryland's Eastern Shore, the weekend sailors. They are unmistakable with their deep tans, their baggy shorts, their frayed polo shirts, their Top-Siders worn without socks. Some may not even own their own boats, much less win regattas, but they are inexorably drawn to the Chesapeake Bay&nbsp;... I planned to spend my days boating, eating as many Chesapeake Bay blue crabs as possible and making a little study of Eastern Shore locals. For city folk like me, they're interesting, even exotic&nbsp;–the weather-beaten crabbers and oystermen called "watermen," gentlemen-farmers and sharecroppers, boat builders, antiques dealers&nbsp;– all of whom sound like Southerners with mouthfuls of marbles when they talk. — Susan Spano, ''[[Los Angeles Times]]'', 2008<ref name=twsT27>{{cite news |first=Susan |last=Spano |title=Peak Season on Chesapeake Bay |newspaper=Los Angeles Times |date=June 23, 2002 |url=http://www.latimes.com/travel/la-062302maryland,0,2017585.story |access-date= 2011-04-20
}}</ref>}}

The Chesapeake Bay plays an extremely important role in Maryland, Virginia, and Pennsylvania's economies, in addition to the ecosystem. The nature-based recreation of wildlife, boating, and ecotourism are dependent on enforcement of the [[Clean Water Act]] (CWA), which regulates pollutant discharges and supports related pollution control programs. In 2006, "roughly eight million wildlife watchers spent $636 million, $960 million, and $1.4 billion in Maryland, Virginia, and Pennsylvania" according to the [[Chesapeake Bay Foundation]].<ref>{{cite web |last1=Grisham |first1=Carrie |title=The Economic Importance of the Bay |url=https://www.cbf.org/issues/what-we-have-to-lose/economic-importance-of-the-bay/index.html |publisher=Chesapeake Bay Foundation |access-date=1 November 2020}}</ref>

==Cuisine==
In [[Cuisine of the Thirteen Colonies|colonial]] times, simple cooking techniques were used to create one pot meals like ham and potato [[casserole]], clam chowder, or stews with common ingredients like oysters, chicken or venison. When John Smith landed in Chesapeake in 1608, he wrote: "The fish were so thick, we attempted to catch them with frying pans". Common regional ingredients in the local cuisine of Chesapeake included [[terrapin]]s, smoked hams, blue crab, shellfish, local fish, game meats and various species of waterfowl. Blue crab continues to be an especially popular regional specialty.<ref>{{cite book |last1=Shields |first1=John |title=Chesapeake Bay Cooking |publisher=Johns Hopkins University Press}}</ref>

==Environmental issues==
===Agricultural pollution in the colonial era===
European settlers around the Chesapeake Bay in the late 17th and early 18th centuries brought with them industrial agricultural techniques. Land clearance and deep plowing of farmland increased sediment and nutrient loading into the bay, which continued to increase as the area continued to develop.<ref name="Cooper & Brush 1991">{{cite journal |last1=Cooper |first1=S.R. |last2=Brush |first2=G.S. |title=Long-Term History of Chesapeake Bay Anoxia |date=1991 |journal=Science |volume=254 |issue=5034 |pages=992–996 |doi=10.1126/science.254.5034.992 |pmid=17731522 |bibcode=1991Sci...254..992C }}</ref>

=== Pollution in the 20th century ===
{{Citation style|1=section|date=July 2025}}
[[File:DEAD MENHADEN FLOAT ALONG THE TIDE LINE JUST NORTH OF THE CHESAPEAKE BAY BRIDGE - NARA - 546836 adj.jpg|thumb|upright|Dead [[menhaden]] floating in the bay in 1973]]
[[File:Chesapeake Bay - Dissolved oxygen requirements.jpg|thumb|[[Dissolved Oxygen|Dissolved oxygen]] levels (Milligrams per liter) required by various marine animals living in the Chesapeake Bay.]]
[[File:MD State DO Map.jpg|thumb|Dissolved oxygen levels, 2023]]
In the 1970s, the Chesapeake Bay was found to contain one of the planet's first identified [[marine dead zone]]s, where waters were so depleted of oxygen that they were unable to support life, resulting in massive [[fish kill]]s. In 2010 the bay's dead zones were estimated to kill 75,000 tons of bottom-dwelling clams and worms each year, weakening the base of the estuary's [[food chain]] and robbing the blue crab in particular of a primary food source. Crabs are sometimes observed to amass on shore to escape pockets of oxygen-poor water, a behavior known as a "crab jubilee". [[Hypoxia (environmental)|Hypoxia]] results in part from large [[algal bloom]]s, which are nourished by the runoff of residential, farm and industrial [[wastewater|waste]] throughout the watershed. A 2010 report criticized [[Amish]] farmers in Pennsylvania for raising cows with inadequate controls on the manure that they generate. Farms in [[Lancaster County, Pennsylvania]] generate large quantities of manure that washes into tributaries of the bay.<ref name=twsT23>{{cite news |first=Sindya N. |last=Bhanoo |title=Amish Farming Draws Rare Government Scrutiny |newspaper=The New York Times |date=2010-06-08 |url=https://www.nytimes.com/2010/06/09/science/earth/09amish.html}}</ref>

The pollution entering the bay has multiple components that contribute to algal blooms, principally the nutrients [[phosphorus]] and [[nitrogen]]. The algae prevents sunlight from reaching the bottom of the bay while alive and deoxygenates the bay's water when it dies and rots. Soil erosion and runoff of [[sediment]] into the bay, exacerbated by devegetation, construction and the prevalence of pavement in urban and suburban areas, also block vital sunlight. The resulting loss of [[aquatic plant|aquatic vegetation]] has depleted the habitat for much of the bay's animal life. Beds of [[Zostera|eelgrass]], the dominant variety in the southern Chesapeake Bay, have shrunk by more than half there since the early 1970s. Overharvesting, pollution, sedimentation and disease have turned much of the bay's bottom into a muddy wasteland.<ref>{{cite web |url=http://www.cbf.org/Document.Doc?id=172 |title=Bad Water and the Decline of Blue Crabs in the Chesapeake Bay |publisher=Chesapeake Bay Foundation |date=December 2008 |access-date=2009-01-21 |archive-url=https://web.archive.org/web/20100617053029/http://www.cbf.org/Document.Doc?id=172 |archive-date=2010-06-17}}</ref>

The principal sources of nutrient pollution in the bay are [[surface runoff]] from farms, as well as runoff from urban and suburban areas. About half of the nutrient pollutant loads in the bay are generated by manure and poultry litter.<ref>{{cite web |title=Agricultural Runoff |url=https://www.chesapeakebay.net/issues/threats-to-the-bay/agricultural-runoff |website=Threats to the Bay |access-date=2022-12-24 |publisher=Chesapeake Bay Program}}</ref> Extensive use of lawn fertilizers<ref>{{cite web |last=Pimental |first=Alicia |title=Report details effects of pollution from lawn fertilizer on Chesapeake Bay |url=https://www.chesapeakebay.net/news/blog/report-details-effects-of-pollution-from-lawn-fertilizer-on-chesapeake-bay |date=2011-03-29 |publisher=Chesapeake Bay Program}}</ref><ref>{{cite news |first=Darryl |last=Fears |title=Lawns are adding to Chesapeake Bay pollution, study says |newspaper=The Washington Post|date=2011-03-28 |url=https://www.washingtonpost.com/national/lawns-are-adding-to-chesapeake-bay-pollution-study-says/2011/03/28/AFDCOdqB_story.html}}</ref> and air pollution from motor vehicles and power plants are also significant nutrient sources.<ref>{{cite web |title=Air Pollution |url=https://www.chesapeakebay.net/issues/threats-to-the-bay/air-pollution |website=Threats to the Bay|access-date=2022-12-24 |publisher=Chesapeake Bay Program}}</ref>

The sediment record of the bay shows a major increase in nutrient levels, suggesting limited availability of oxygen, starting between the 17th and 18th centuries.<ref name="Cooper & Brush 1991"/> (Zimmerman & Canuel, 2002) The overloading of nutrients into the bay only continued to increase throughout the modern era. Recently deposited sediments in the bay have 2 to 3 times greater amounts of organic carbon, and 4 to 20 times greater amounts of nitrogen and phosphorus input into the bay than the pre-colonial era (Cornwell et al., 1996; Fisher et al., 2006).

The nutrient runoff from land sources causes a huge increase in available nutrients in the water. Algae present in the bay take up those nutrients and rapidly reproduce in algal blooms. As algae sink to the bottom, they are decomposed, consuming oxygen (Long et al. 2014). Seasonal stratification in the bay typically occurs between Spring and early Fall (Officer et al. 1984; Cerco & Noel 2007). More sunlight, higher temperatures, and less storms and winds during the summer cause strongly stratified water column, with a pycnocline typically 10 meters below the surface (Cerco & Noel; Seliger et al.). As oxygen is depleted from the decomposition of organic matter in bottom waters, but is not able to exchange gas with surface water due to a strong pycnocline, dissolved oxygen levels reach near zero by mid-June and can persist until October (Officer et al.). Organisms living in bottom waters may have some tolerance to hypoxia, but when events exceed their tolerance, ecologically and commercially important crabs, oysters, and mesoplankton become unhealthy and may experience die offs (Kirby & Miller; Officer; Kimmel).

One particularly harmful source of [[toxicity]] is ''[[Pfiesteria piscicida]]'', which can affect both fish and humans. ''Pfiesteria'' caused a small regional panic in the late 1990s when a series of large blooms started killing large numbers of fish while giving swimmers mysterious rashes; nutrient runoff from chicken farms was blamed for the growth.<ref>{{cite news |title=Md. Gets Tough on Chicken Farmers |first=David A. |last=Fahrenthold |newspaper=The Washington Post|date=2008-09-12 |url=https://www.washingtonpost.com/wp-dyn/content/article/2008/09/11/AR2008091103841.html}}</ref>

=== Sewage overflows and treatment plant upsets ===
[[Sanitary sewer]]s and some [[sewage treatment]] plants in the Chesapeake Bay region have occasionally contributed significant pollution to the bay. Although the region's treatment plants are designed to meet state and federal standards, the Baltimore city sewage collection system experiences [[sanitary sewer overflow]]s (SSOs) during large rainstorms, which can cause excessive pollutant discharges into the bay.<ref>{{cite web |title=Sanitary Sewer Overflows |date=9 April 2015 |url=https://health.baltimorecity.gov/sanitary-sewer-overflows-sso |access-date=2025-03-03 |publisher=Baltimore City Health Department}}</ref> In 2021, 11% of nitrogen and 15% of phosphorus levels in the Chesapeake Bay were traced from sewage plants.<ref>{{Cite web |title=Baltimore's Sewage Along With Farm Run-Off and Other Pollutants Are Killing Chesapeake Bay |url=https://pulitzercenter.org/stories/baltimores-sewage-along-farm-run-and-other-pollutants-are-killing-chesapeake-bay |date=2023-05-04 |publisher=Pulitzer Center |location=Washington, D.C.}}</ref> In 2024, a heavy rainfall led to the overflow of 14 million gallons of sewage discharged by the [[Back River Wastewater Treatment Plant]]. The sewage leaked into local Baltimore waterways and the bay, leading to an amount of sewage overflow expected in one year to be released in one day.<ref>{{Cite AV media |url=https://www.youtube.com/watch?v=cyKtOt5vbE4 |title=14 million gallons of sewage overflow spills into Baltimore waterways |date=2024-01-18 |last=WBFF FOX45 Baltimore |access-date=2025-03-03 |via=YouTube}}</ref> The city has also had difficulty in providing regular adequate maintenance at the Back River plant, which can lead to spills and leaks.<ref>{{cite news |last1=Azhar |first1=Aman |title=Baltimore City, Maryland Department of the Environment Settle Lawsuits Over City-Operated Sewage Treatment Plants |url=https://insideclimatenews.org/news/07112023/baltimore-settlement-wastewater-plants/ |access-date=December 25, 2024 |work=Inside Climate News |date=November 7, 2023}}</ref>

The Patapsco and Back River plants, the two largest treatment plants in Maryland, have contributed to the growth of [[Phragmites|phragmite]] plants in biological cleaning tanks, which are used for cleaning returning water of nitrogen and phosphorus. In 2021 the city completed its "Headworks Project" at the Back River plant which provides additional underground storage of wastewater, to address the SSO problems, at a cost of $124 million.<ref>{{cite web |title=The Headworks Project |date=11 August 2017 |url=https://publicworks.baltimorecity.gov/sewer-consent-decree/headworks-project |access-date=2025-03-03 |publisher=Baltimore City Department of Public Works}}</ref><ref>{{Cite web |title=Baltimore's Wastewater Treatment Plants |url=https://www.cbf.org/about-cbf/locations/maryland/issues/baltimores-wastewater-treatment-plants.html#:~:text=The%20problems%20caused%20the%20plants,to%20low%20dissolved%20oxygen%20levels. |access-date=2025-03-03 |publisher=Chesapeake Bay Foundation}}</ref> In April 2025 the [[Maryland Department of the Environment]] announced that it had awarded grants to make further improvements to the Baltimore treatment plants, and to install a [[trash interceptor]] on the Back River.<ref>{{cite web |title=Maryland Department of the Environment Announces $1.7 Million in Community Projects, Progress on Pollution Reduction at Back River and Patapsco River Wastewater Treatment Plants |url=https://news.maryland.gov/mde/2025/04/15/maryland-department-of-the-environment-announces-1-7-million-in-community-projects-progress-on-pollution-reduction-at-back-river-and-patapsco-river-wastewater-treatment-plants/ |date=2025-04-15 |publisher=Maryland Department of the Environment (MDE) |location=Baltimore, MD |id=Press release}}</ref>

Washington, D.C., similar to Baltimore and many older U.S. cities, operates a [[combined sewer]] system. The oldest portions of the sewage collection system were built in the late 19th and early 20th centuries, and cover about one-third of the city's service area. During large rain storms, the collection system may be overloaded, leading to [[combined sewer overflow]]s (CSOs) and discharges of untreated sewage into the Potomac River, [[Anacostia River]] and [[Rock Creek (Potomac River tributary)|Rock Creek]]. To address the city's CSO problems, in 2013 [[District of Columbia Water and Sewer Authority|DC Water]] began building large stormwater storage facilities as part of its "[[District of Columbia Water and Sewer Authority#DC Water Clean Rivers Project|Clean Rivers]]" project. As of 2025 portions of the storage tunnel system are in operation. When the $2.99 billion project concludes in 2030 the system improvements, which include construction of {{convert|18|mi|km}} of tunnels, as well as [[green infrastructure]] projects, are expected to reduce CSO discharges by 96%.<ref>{{cite web |title=DC Water's Clean Rivers Project |url=https://www.dcwater.com/cleanrivers |access-date=2025-03-03 |publisher=District of Columbia Water and Sewer Authority (DC Water)}}</ref><ref>{{cite web |title=DC Water Awards $819 Million Contract for Potomac River Tunnel |url=https://www.dcwater.com/about-dc-water/media/news/dc-water-awards-819-millon-contract-potomac-river-tunnel |date=2023-10-06 |publisher=DC Water}}</ref>

=== Depletion of oysters ===
While the bay's salinity is ideal for oysters and the oyster fishery was at one time the bay's most commercially viable,<ref name=econ>{{cite magazine |url=http://www.economist.com/world/unitedstates/displaystory.cfm?story_id=12795573 |title=Oysters: Gem of the Ocean |magazine=The Economist |date=December 8, 2008}}</ref> the population has in the last fifty years been devastated. Maryland once had roughly {{convert|200000|acre|km2}} of oyster reefs. In 2008 there were about {{convert|36000|acre|km2}}.<ref name=econ/> It has been estimated that in pre-colonial times, oysters could filter the entirety of the bay in about 3.3 days; by 1988 this time had increased to 325 days.<ref>{{cite web|url=http://habitat.noaa.gov/restorationtechniques/public/habitat.cfm?HabitatID=2&HabitatTopicID=11 |title=Oyster Reefs: Ecological importance |publisher=US National Oceanic and Atmospheric Administration (NOAA) |access-date=2007-11-06 |archive-url=https://web.archive.org/web/20081003114619/http://habitat.noaa.gov/restorationtechniques/public/habitat.cfm?HabitatID=2&HabitatTopicID=11 |archive-date=October 3, 2008 }}</ref> The harvest's gross value decreased 88% from 1982 to 2007.<ref>{{cite web|url=http://www.nao.usace.army.mil/OysterEIS/PeerReviews/ResearchDocs/OysterNPV1107_rev_1.pdf |title=Estimating Net Present Value in the Northern Chesapeake Bay Oyster Fishery |publisher=NOAA Chesapeake Bay Office |date=2008-11-07 |access-date=2009-09-08 |archive-url=https://web.archive.org/web/20090629143549/http://www.nao.usace.army.mil/OysterEIS/PeerReviews/ResearchDocs/OysterNPV1107_rev_1.pdf |archive-date=June 29, 2009 }}</ref> One report suggested the bay had fewer oysters in 2008 than 25 years earlier.<ref name="twsT13"/> The primary problem is [[overharvesting]]. Lax government regulations allow anyone with a license to remove oysters from state-owned beds, and although limits are set, they are not strongly enforced. The overharvesting of oysters has made it difficult for them to reproduce, which requires close proximity to one another. A second cause for the oyster depletion is that the drastic increase in human population caused a sharp increase in pollution flowing into the bay.<ref name=econ/>{{Update inline|date=August 2025}} The bay's oyster industry has also suffered from two diseases: [[Haplosporidium nelsoni|MSX]] and [[Perkinsus marinus|Dermo]].<ref>{{cite web|url=http://www.vims.edu/env/research/shellfish/ |title=Research – Shellfish Diseases |publisher=Virginia Institute of Marine Science |location=Gloucester Point, VA |date=2007-03-16 |access-date=2008-02-22 |archive-url=https://web.archive.org/web/20070211013712/http://www.vims.edu/env/research/shellfish/ |archive-date=February 11, 2007 }}</ref>

The depletion of oysters has had a particularly harmful effect on the quality of the bay. Oysters serve as natural water filters, and their decline has further reduced the water quality of the bay. Water that was once clear for meters is now so [[turbidity|turbid]] that a wader may lose sight of his feet while his knees are still dry.{{Citation needed|date=December 2021}}

=== Institutional responses to pollution problems ===
Concern about the increasing discoveries of bay pollution problems, and of the institutional challenges of organizing bay restoration programs over a large geographical area, led to [[United States Congress|Congress]] directing the [[US Environmental Protection Agency]] (EPA) to take a greater role in studying the scientific and technical aspects of the problems beginning in the late 1970s. The agency conducted its research over a seven-year period and published a major report in 1983. The report stated that the bay was an "ecosystem in decline" and cited numerous instances of declines in the populations of oysters, crabs, freshwater fish and other wildlife.<ref>{{Cite report |title=Chesapeake Bay Program: Findings and Recommendations |url=https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=2000VS94.txt |date=September 1983 |publisher=U.S. Environmental Protection Agency (EPA) |location=Philadelphia, PA |id=EPA 903/R-83/008}}</ref><ref name="NYT-Franklin">{{Cite news |last=Franklin |first=Ben A. |title=Chesapeake Bay Study Citing Pollution Threats |url= https://www.nytimes.com/1983/09/27/us/chesapeake-bay-study-citing-pollution-threats.html |date=1983-09-27 |newspaper=The New York Times |page=A24}}</ref>

The growing concerns about pollution also prompted the legislatures of Maryland and Virginia to establish the [[Chesapeake Bay Commission]], an advisory body, in 1980. The commission consults with the state legislatures and executive agencies, as well as Congress, about environmental, economic and social issues related to the bay.<ref>{{cite web |title=History |url=https://www.chesbay.us/history |access-date=2022-01-15 |website=About Us |publisher=Chesapeake Bay Commission |location=Annapolis, MD}}</ref>

As an initial follow-up to the EPA report, the Chesapeake Bay Commission and EPA developed the ''Chesapeake Bay Agreement'' in 1983. The agreement was signed by the governors of Maryland, Virginia and Pennsylvania; the Mayor of the District of Columbia; and the EPA Administrator. The parties agreed to:
* Creation of an "Executive Council" consisting of cabinet-level appointees from each state and Washington, D.C., and the EPA Regional Administrator
* The council's creation of an implementation committee to coordinate technical issues and development management plans for bay restoration
* The establishment of the [[Chesapeake Bay Program]] as a liaison office for all of the participating organizations. The program's office, based in Annapolis, is partially funded by EPA and staffed by experts from the member states, EPA and other federal agencies, and academic institutions.<ref>{{cite web |publisher=Chesapeake Bay Program (CBP) |location=Annapolis, MD |date=1983 |url=http://www.chesapeakebay.net/content/publications/cbp_12512.pdf |title=1983 Chesapeake Bay Agreement}}</ref>
Concurrent with the 1983 agreement EPA began providing matching grants to the bay states for research and restoration projects.<ref name="NYT-Franklin"/>

In 1987 the parties agreed to set a goal of reducing the amount of nutrients that enter the bay by 40 percent by 2000. In 1992, the bay program partners agreed to continue the 40 percent reduction goal beyond 2000 and to attack nutrients at their source: upstream, in the bay [[tributaries]].<ref>{{cite web |title=1987 Chesapeake Bay Agreement |url=http://www.chesapeakebay.net/content/publications/cbp_12510.pdf |date=1987 |publisher=CBP}}</ref>

In response to the decline of the oyster population, for decades the [[Maryland Department of Natural Resources]] (MDNR) has restricted the amount of oyster harvesting in the bay, and designated certain areas as off-limits to harvesting.<ref>{{cite news |last=Vesey |first=Tom |title=Maryland Oystermen Face Troubled Waters |url=https://www.washingtonpost.com/archive/politics/1987/09/20/maryland-oystermen-face-troubled-waters/c90c58c7-ba31-4009-94b6-8844c8f25ea5/ |date=1987-09-20 |newspaper=The Washington Post}}</ref><ref>{{cite news |last=Turque |first=Bill |title=Oyster population in protected areas of Chesapeake shows signs of renewal |url=https://www.washingtonpost.com/local/md-politics/oyster-population-in-protected-areas-of-chesapeake-shows-signs-of-renewal/2016/08/01/144d8380-57e7-11e6-9aee-8075993d73a2_story.html |date=2016-08-01 |newspaper=The Washington Post}}</ref> As of 2025 MDNR continues to regulate oyster harvesting by limiting the amount of oysters harvested per day, and limiting the number of harvest days per week.<ref>{{cite web |title=2025-2026 Commercial Oyster Rules — Effective 7/4/2025  |url=https://dnr.maryland.gov/fisheries/Documents/Public_Notices/PubNot2025-2026%20CommercialOysterRules_July2025.pdf |date=2025-06-30 |publisher=MDNR |id=Public notice}}</ref>

===Restoration efforts===
[[File:Flickr - The U.S. Army - Corps of Engineers restoring oysters in Chesapeake tributaries.jpg|thumb|upright|A cluster of oysters grown in a sanctuary]]
Efforts of federal, state and local governments, working in partnership through the Chesapeake Bay Program along with the Chesapeake Bay Foundation and other nonprofit environmental groups, to restore or at least maintain the current [[water quality]], have had mixed results. One particular obstacle to cleaning up the bay is that much of the polluting substances are discharged far upstream in states far removed from the bay: New York and Pennsylvania. Despite the State of Maryland spending over $100 million to restore the bay, conditions have continued to grow worse. In the mid-20th century, the bay supported over 6,000 oystermen. As of 2008, there were fewer than 500.<ref>{{cite news |url=https://www.nytimes.com/2008/11/29/us/29poultry.html?partner=rss&emc=rss |work=The New York Times |date=2008-11-29 |title=In Maryland, Focus on Poultry Industry Pollution |first=Ian |last=Urbina |page=A14}}</ref>{{Update inline|date=December 2021}}

In June 2000, the Chesapeake Bay Program adopted ''Chesapeake 2000,'' an agreement adopted by the member jurisdictions, intended to guide restoration activities throughout the Chesapeake Bay watershed through 2010.<ref>CBP (2000). [http://www.chesapeakebay.net/content/publications/cbp_12081.pdf "Chesapeake 2000."]</ref> One component of this agreement was a series of upgrades to [[sewage treatment]] plants throughout the watershed. In 2016 EPA stated that the upgrades "have resulted in steep reductions in nitrogen and phosphorus pollution... despite increases in human population and wastewater volume."<ref>{{cite web |title=Chesapeake Bay Progress: Wastewater Pollution Reduction Leads the Way |url=https://www.epa.gov/sites/default/files/2016-06/documents/wastewater_progress_report_06142016.pdf |date=June 2016 |publisher=U.S. Environmental Protection Agency (EPA) |location=Philadelphia, PA}}</ref>

EPA published a series of scientific documents on [[Clean Water Act#Water quality criteria|water quality criteria]] for the bay between 2004 and 2010. The criteria documents, which describe specific pollutants and their effects on aquatic species,<ref>{{cite web |title=Water Quality Criteria |url=https://www.epa.gov/wqc |date=2021-11-17 |publisher=EPA}}</ref> are used by the states to develop [[Clean Water Act#Water quality standards|water quality standards]] (WQS) for individual water bodies.<ref>{{cite web |title=What are Water Quality Standards? |url=https://www.epa.gov/wqs-tech/what-are-water-quality-standards |date=2021-02-26 |publisher=EPA}}</ref> Delaware, Maryland, Virginia, and the District of Columbia adopted WQS for various Chesapeake Bay tributaries in the mid-2000s, referencing the EPA criteria documents, as well as their own extensive data gathering and modeling efforts.<ref name="EPA TMDL 2010, sec. 3">{{cite report |title=Chesapeake Bay Total Maximum Daily Load for Nitrogen, Phosphorus and Sediment |chapter=Section 3. Chesapeake Bay Water Quality Standards |chapter-url=https://www.epa.gov/sites/default/files/2014-12/documents/cbay_final_tmdl_exec_sum_section_1_through_3_final_0.pdf= |date=2010-12-29 |publisher=EPA}}</ref>

Restoration efforts that began in the 1990s have continued into the 21st century and show potential for growth of the native oyster population.<ref name="WashPost 2013-11-19"/><ref name="ABCNews 2015-02-01"/> Efforts to repopulate the bay using oyster hatcheries have been carried out by a group called the [[Oyster Recovery Partnership]], with some success. In 2011 the group placed 6 million oysters on {{convert|8|acre|m2|spell=in}} of the Trent Hall sanctuary.<ref name=som>[http://www.somdnews.com/stories/08122009/rectop152311_32182.shtml Program turns pork into oysters] {{webarchive |url=https://web.archive.org/web/20110412173448/http://www.somdnews.com/stories/08122009/rectop152311_32182.shtml |date=2011-04-12}}, Jesse Yeatman, South Maryland Newspapers Online, August 12, 2009.</ref> Scientists from the [[Virginia Institute of Marine Science]] at the [[College of William & Mary]] claim that experimental reefs created in 2004 now house 180 million native oysters, ''[[Crassostrea virginica]]'', which is far fewer than the billions that once existed.<ref name=Times>{{cite news |url=https://www.nytimes.com/2009/08/04/science/04oyster.html |title=Oysters Are on the Rebound in the Chesapeake Bay |first=Henry |last=Fountain |work=The New York Times |date=August 3, 2009}}</ref>

[[Dam]]s on bay tributaries have blocked passages for [[migratory fish]]. Removing such blockages was one of the goals identified in the 2014 bay watershed agreement. During 2022-2023, 13 dams were removed, yielding a total of {{convert |303|mi|km}} of tributaries opened to restore fish migration. Since 1989, the cumulative total of fish migration route restorations in the tributaries is {{convert |35258|mi|km}}.<ref>{{cite web |title=Removing stream blockages opens 303 miles for fish passage in 2022-2023 |url=https://www.chesapeakebay.net/news/pressrelease/removing-stream-blockages-opens-303-miles-for-fish-passage-in-2022-2023 |date=2025-10-15 |publisher=Chesapeake Bay Program |location=Annapolis, MD |id=Press release}}</ref>

=== Regulatory actions ===
[[File:Chesapeake Bay TSS sources.jpg|thumb|Sediment sources in the Chesapeake Bay]]
In 2009 the Chesapeake Bay Foundation (CBF) filed suit against EPA for its failure to finalize a [[total maximum daily load]] (TMDL) ruling for the bay, pursuant to the Clean Water Act. The TMDL would restrict [[water pollution]] from farms, land development, power plants and sewage treatment plants.<ref>{{cite news |last=Fahrenthold |first=David A. |title=Bay Advocates Sue EPA |url=https://www.washingtonpost.com/wp-dyn/content/article/2009/01/05/AR2009010501175.html |date=2009-01-06 |newspaper=The Washington Post}}</ref> EPA, which had been working with the states on various components of the TMDL since the 1980s (e.g. water quality criteria, standards for individual tributaries, improvements in data gathering and modeling techniques),<ref name="EPA TMDL 2010, sec. 3"/> agreed to settle the lawsuit and issued its TMDL for nitrogen, phosphorus and sediment pollution on December 29, 2010. This was the largest, most complex TMDL document that EPA had issued to date.<ref>{{cite report |title=Chesapeake Bay TMDL Executive Summary |url=https://www.epa.gov/sites/default/files/2014-12/documents/bay_tmdl_executive_summary_final_12.29.10_final_1.pdf |date=2010-12-29 |publisher=EPA}}</ref> The TMDL was challenged in litigation by the agriculture and construction industries, but EPA's document was upheld by the courts.<ref>{{cite news |last=Fears |first=Darryl |title=Supreme Court ends challenge to the Chesapeake Bay cleanup plan |url=https://www.washingtonpost.com/news/energy-environment/wp/2016/03/01/supreme-court-ends-challenge-to-the-chesapeake-bay-cleanup-plan/ |date=2016-03-01 |newspaper=The Washington Post}}</ref>

In 2020 the CBF filed another lawsuit against EPA for its failure to require the states of New York and Pennsylvania to comply with their TMDL goals and reduce pollution in the bay.<ref>{{cite news |last=Finley |first=Ben |title=Lawsuit: EPA fails to enforce Chesapeake Bay pollution caps |url=https://www.washingtonpost.com/climate-environment/lawsuit-epa-fails-to-enforce-chesapeake-bay-pollution-caps/2020/09/10/914ad908-f39e-11ea-8025-5d3489768ac8_story.html |date=2020-09-10 |newspaper=The Washington Post|agency=Associated Press}}</ref> CBF and EPA reached a settlement on the lawsuit in 2023. EPA agreed to increase its efforts to reduce farm and stormwater runoff pollution in Pennsylvania, including compliance and enforcement actions.<ref>{{cite web |title=EPA Activities Pursuant to 2023 Settlement Agreement |url=https://www.epa.gov/chesapeake-bay-tmdl/epa-activities-pursuant-2023-settlement-agreement |date=2024-09-12 |publisher=EPA}}</ref><ref>{{cite web |title=Settlement Reached in Suit Over Pennsylvania Pollution |url=https://www.cbf.org/news-media/newsroom/2023/federal/settlement-reached-in-suit-over-pennsylvania-pollution.html |date=2023-07-12 |publisher=Chesapeake Bay Foundation |id=Press release}}</ref>

EPA's 2010 TMDL document requires all states in the bay watershed region to develop detailed implementation plans for pollutant reduction.<ref>{{cite web |title=Chesapeake Bay Milestones |url=https://www.epa.gov/chesapeake-bay-tmdl/chesapeake-bay-milestones |date=2024-05-17 |website=Chesapeake Bay TMDL |publisher=EPA}}</ref> The states have been developing their plans for years, in many cases building upon restoration projects that they had initiated before EPA's TMDL was finalized.<ref>For example, see "Maryland's Two-Year Milestones", documents issued biennially outlining the state's projects and goals for pollution reduction. The state intends to initiate "all necessary pollution reduction actions" by 2025. {{cite web |title=Maryland's Two-Year Milestones |url=https://mde.state.md.us/programs/Water/TMDL/TMDLImplementation/Pages/milestones.aspx |access-date=2024-11-04 |publisher=Maryland Department of the Environment (MDE) |location=Baltimore, MD |archive-date=2022-01-20 |archive-url=https://web.archive.org/web/20220120083927/https://mde.state.md.us/programs/Water/TMDL/TMDLImplementation/Pages/milestones.aspx }}</ref> These plans are long and complex, involving regular consultation with many stakeholders (i.e. governments, industry, agriculture, citizen groups). The plans include multiple milestone goals for project initiation or continued progress in water quality, through the use of pollution control upgrades (such as at sewage treatment plants) and more widespread utilization of various [[Best management practice for water pollution|best management practices]] (BMPs). The BMPs are designed for specific sites to control pollution from nonpoint sources, principally agriculture, [[land development]] and urban runoff. For example, a farmer may install vegetated [[stream buffer]]s along a stream bank to reduce runoff of sediment, nutrients and other pollutants.<ref>{{cite web |title=Riparian Forest Buffer; Conservation Practice Job Sheet |url=https://www.wcc.nrcs.usda.gov/ftpref/wntsc/strmRest/buffers/RiprarianForestBufferJobSheet.pdf |date=1997 |publisher=U.S. Natural Resources Conservation Service |location=Washington, D.C. |access-date=2021-12-29 |archive-date=2021-12-29 |archive-url=https://web.archive.org/web/20211229172006/https://www.wcc.nrcs.usda.gov/ftpref/wntsc/strmRest/buffers/RiprarianForestBufferJobSheet.pdf }}</ref> A land developer may install [[stormwater management]] facilities such as [[infiltration basin]]s or [[constructed wetland]]s during the construction of housing or commercial buildings.<ref>{{Cite book |author=National Research Council, Committee on Reducing Stormwater Discharge Contributions to Water Pollution |chapter-url=http://www.nap.edu/read/12465/chapter/7 |title=Urban Stormwater Management in the United States |chapter=5. Stormwater Management Approaches |date=2009 |publisher=National Academies Press |location=Washington, D.C. |isbn=978-0-309-12540-6}}</ref>

In 2011 both Maryland and Virginia enacted laws to reduce the effects of lawn fertilizer use, by restricting nitrogen and phosphorus content.<ref>{{cite web |last=Pimental |first=Alicia |title=Maryland passes law to reduce pollution from lawn fertilizer |url=https://www.chesapeakebay.net/news/blog/maryland-passes-law-to-reduce-pollution-from-lawn-fertilizer |date=2011-05-23 |publisher=Chesapeake Bay Program}}</ref> The Virginia law also banned [[Deicing|deicers]] containing urea, nitrogen or phosphorus.<ref>{{cite web |last=Pimental |first=Alicia |title=Va. governor signs bill banning phosphorus lawn fertilizer |url=https://www.chesapeakebay.net/news/blog/va-governor-signs-bill-banning-lawn-fertilizer-containing-phosphorus |date=2011-08-18 |publisher=Chesapeake Bay Program}}</ref>

Installation of stormwater management facilities is already a requirement for most new construction projects in the bay region, under various state and local government requirements. These facilities reduce erosion and keep sediment and other pollutants from entering tributaries and the bay.<ref>For example, see the {{cite report |title=Maryland Stormwater Design Manual, Volumes I and II |url=https://mde.maryland.gov/programs/Water/StormwaterManagementProgram/Pages/stormwater_design.aspx |date=May 2009 |publisher=MDE}}</ref> However retrofitting such facilities into existing developed areas is often expensive due to high land costs, or difficult to install among existing structures. As a result, the extent of such retrofit projects in the bay region has been limited.<ref>{{cite report |title=Constructing Stormwater Retrofits in Maryland: Challenges & Recommendations for Cost Estimation |url=https://owl.cwp.org/?mdocs-file=9254 |date=January 2019 |publisher=Center for Watershed Protection |location=Ellicott City, MD}}</ref>

In May 2025 Governor [[Wes Moore]] signed the Chesapeake Bay Legacy Act which allots up to $900,000 per year to a new certification program for farmers who use sustainable practices that decrease runoff into the bay, establishes a water quality monitoring program to unify current testing efforts and aims to streamline oyster aquaculture leasing, among other provisions.<ref>{{cite web |title=Moore signs Chesapeake Bay bill as federal cuts loom large |url=https://marylandmatters.org/2025/05/14/moore-signs-chesapeake-legacy-act/ |website=Maryland Matters |date=14 May 2025 |access-date=14 May 2025}}</ref>

=== Water quality improvements ===
In 2010 bay health improved slightly in terms of the overall health of its ecosystem, earning a rating of 31 out of 100, up from a 28 rating in 2008.<ref name=twsT16/>{{Update inline|date=December 2021}} An estimate in 2006 from a "blue ribbon panel" said cleanup costs would be $15 billion.<ref name=twsT21>{{cite news |author= Terry Smith (commentator), Michele Norris (host) |title=The Chesapeake Bay, Scenic and Unhealthy |publisher=NPR |date=April 13, 2006 |url=https://www.npr.org/templates/story/story.php?storyId=5341055 |access-date= 2011-04-20}}</ref> Compounding the problem is that 100,000 new residents move to the area each year.<ref name=twsT21/> A 2008 ''Washington Post'' report suggested that government administrators had overstated progress on cleanup efforts as a way to "preserve the flow of federal and state money to the project."<ref name=twsT12>{{cite news |first=David A. |last=Fahrenthold |title=Failing the Chesapeake Bay—Broken Promises on the Bay |newspaper=The Washington Post|date=2008-12-27 |url= https://www.washingtonpost.com/wp-dyn/content/article/2008/12/26/AR2008122601712.html}}</ref> In January 2011, there were reports that millions of fish had died, but officials suggested it was probably the result of extremely cold weather.<ref name=twsT11>{{cite news |title=Two Million Dead Fish Appear in Chesapeake Bay |publisher=CBS News |date=2011-01-05 |url=https://www.cbsnews.com/news/two-million-dead-fish-appear-in-chesapeake-bay/ |access-date=2011-04-20 |archive-date=2011-04-25 |archive-url=https://web.archive.org/web/20110425114644/http://www.cbsnews.com/stories/2011/01/05/national/main7216597.shtml |url-status=live }}</ref>

The health of the Chesapeake Bay improved in 2015, marking three years of gains over a four-year period, according to a 2016 report by the [[University of Maryland Center for Environmental Science]] (UMCES).<ref name="Cox 2016"/> In 2021 scientists at the UMCES reported slight improvements in bay water quality compared to levels measured in 2020. The greatest improvements were seen in the lower bay areas, while the [[Patapsco River]] and [[Back River (Maryland)]] regions showed minimal improvement. Positive indicators included decreased nitrogen levels and increases in dissolved oxygen.<ref name="Lai 2021"/>

The CBF reported that as of 2022 pollution control efforts in the bay have continued to show mixed results, with no improvement in levels of toxic contaminants, nitrogen and dissolved oxygen, and a small decrease in water clarity compared to 2020 levels (measured as [[Secchi depth]]). Oyster and rockfish populations in the bay have improved, but blue crab populations have continued to decline.<ref name="CBF 2022">{{cite report |title=State of the Bay 2022 |url=https://www.cbf.org/document-library/cbf-reports/2022-state-of-the-bay-report.pdf |date=2022 |publisher=Chesapeake Bay Foundation}}</ref>

In the 2023 annual report the University of Maryland Center for Environmental Science rated the Chesapeake Bay's overall health a C-plus or 55%, its highest score since 2002.<ref>{{cite web |title=Report card gives Chesapeake Bay a C+, its best grade in 21 years |url=https://marylandmatters.org/2024/07/11/report-card-gives-chesapeake-bay-a-c-its-best-grade-in-21-years/ |website=Maryland Matters|date=12 July 2024 }}</ref><ref>{{cite web |title=Bay Health |url=https://ecoreportcard.org/report-cards/chesapeake-bay/bay-health/ |website=Eco Report Card |access-date=17 July 2024}}</ref>

=== Climate change ===
[[File:Urban-Rural Population and Land Area Estimates, v2, 2010 Washington D.C., U.S. (13873799193).jpg|thumb|Population density and elevation above sea level around the Chesapeake Bay. The Chesapeake Bay is especially vulnerable to [[sea level rise]].]]
The Chesapeake Bay is already experiencing the effects of [[climate change]]. Key among these is sea level rise: water levels in the bay have already risen one foot, with a predicted increase of 1.3 to 5.2 feet in the next 100 years. This has related environmental effects, causing changes in marine ecosystems, destruction of coastal marshes and wetlands, and intrusion of saltwater into otherwise brackish parts of the bay. Sea level rise also compounds the effects of [[extreme weather]] on the bay, making [[coastal flooding]] as part of the events more extreme and increasing runoff from upstream in the watershed.<ref name="Climate-CBP"/><ref name="UMCES-Climate">{{Cite web |date=2017-04-04 |title=Climate change already affecting Chesapeake Bay region |url=https://www.umces.edu/research-highlights/climate-change-already-affecting-chesapeake-bay-region |access-date=2020-12-16 |publisher=University of Maryland Center for Environmental Science |location=Cambridge, MD}}</ref>

With increases in flooding events and sea level rise, the 11,600 miles of coastline, which include significant historic buildings and modern infrastructure, will be at risk of erosion. Islands such as [[Holland Island]] have disappeared due to the rising sea levels.<ref>{{Cite web |title=Climate Change and the Chesapeake Bay |url=https://www.conservationfund.org/projects/climate-change-and-the-chesapeake-bay |access-date=2020-12-16 |publisher=The Conservation Fund |location=Arlington, VA |archive-date=2020-11-29 |archive-url=https://web.archive.org/web/20201129044439/https://www.conservationfund.org/projects/climate-change-and-the-chesapeake-bay }}</ref><ref name="CBP-Island">{{cite web |title=Portrait of an Island Part I: What used to be home |date=20 June 2018 |url=https://www.chesapeakebay.net/news/blog/portrait-of-an-island-part-i |access-date=2022-12-25 |publisher=Chesapeake Bay Program}}</ref>

Beyond sea level rise, other changes in the marine ecosystem due to climate change, such as [[ocean acidification]] and temperature increases, will put increasing pressure on marine life. Projected effects include decreasing dissolved oxygen, more acidic waters making it harder for shellfish to maintain shells and changing the seasonal cycles important for breeding and other lifecycle activities.<ref name="Climate-CBP"/> Seasonal shifts and warmer temperatures also mean that there is a greater likelihood of pathogens to stay active in the ecosystem.<ref name="UMCES-Climate"/>

Climate change may worsen [[Hypoxia (environmental)|hypoxia]]. However, compared to the current effects of [[nutrient pollution]] and [[algal bloom]]s, climate change's effect to increase hypoxia is relatively small. Warmer waters can hold less dissolved oxygen. Therefore, as the bay warms, there may be a longer duration of hypoxia each summer season in the deep central channel of the bay. However, comparing the effects of climate change and nutrient pollution, reduced nutrient pollution would increase oxygen concentrations more dramatically than if climate change were to level out.<ref name="Irby">{{cite journal | last1=Irby | first1=Isaac D. | last2=Friedrichs | first2=Marjorie A. M. | last3=Da | first3=Fei | last4=Hinson | first4=Kyle E. | title=The competing impacts of climate change and nutrient reductions on dissolved oxygen in Chesapeake Bay | journal=Biogeosciences | publisher=Copernicus GmbH | volume=15 | issue=9 | date=4 May 2018 | issn=1726-4189 | doi=10.5194/bg-15-2649-2018 | pages=2649–2668| bibcode=2018BGeo...15.2649I | doi-access=free }}</ref>

[[Climate change adaptation]] and mitigation programs in [[Climate change in Maryland|Maryland]] and [[Climate change in Virginia|Virginia]] often include significant programs to address the communities in the Chesapeake Bay.<ref name=":3">{{Cite news |title=After decades of waterfront living, climate change is forcing communities to plan their retreat from the coasts |url=https://www.washingtonpost.com/magazine/2020/04/13/after-decades-waterfront-living-climate-change-is-forcing-communities-plan-their-retreat-coasts/ |newspaper=The Washington Post}}</ref> Key infrastructure in Virginia, such as the port of [[Norfolk, Virginia|Norfolk]],<ref name=":3" /> and major agriculture and fishing industries of the [[Eastern Shore of Maryland]] will be directly impacted by the changes in the bay.<ref name="EPA">{{cite web |date=August 2016 |title=What Climate Change Means for Maryland |url=https://19january2017snapshot.epa.gov/sites/production/files/2016-09/documents/climate-change-md.pdf |publisher=EPA}}</ref>

===Scientific research===
[[File:(EPA Science Chesapeake Bay 2) 412-DSP-2-2012-08-02 DNRCorsica 033.jpg - DPLA - 0e8feb8ad0b3b8da07012f2bc660c376.jpg|thumb|[[Maryland Department of Natural Resources]] survey vessel tied up to a private dock with a continuous monitoring station.]]
[[File:NOAA-smartbuoy2.jpg|thumb|upright=1.0|[[Chesapeake Bay Interpretive Buoy System]] smart buoy on the [[Patapsco River]].]]
Researchers work in the Chesapeake Bay to collect information about water quality, plant and animal abundances, shoreline erosion, tides, waves, and harmful algal blooms. For example, the [[Virginia Institute of Marine Science]] monitors the abundance of [[submerged aquatic vegetation]] in the shallow areas of the Chesapeake Bay each summer.<ref name="Orth">{{cite journal | last1=Orth | first1=Robert J. | last2=Dennison | first2=William C. | last3=Lefcheck | first3=Jonathan S. | last4=Gurbisz | first4=Cassie | last5=Hannam | first5=Michael | last6=Keisman | first6=Jennifer | last7=Landry | first7=J. Brooke | last8=Moore | first8=Kenneth A. | last9=Murphy | first9=Rebecca R. | last10=Patrick | first10=Christopher J. | last11=Testa | first11=Jeremy | last12=Weller | first12=Donald E. | last13=Wilcox | first13=David J. | title=Submersed Aquatic Vegetation in Chesapeake Bay: Sentinel Species in a Changing World | journal=BioScience | publisher=Oxford University Press (OUP) | volume=67 | issue=8 | date=14 June 2017 | issn=0006-3568 | doi=10.1093/biosci/bix058 | pages=698–712| doi-access=free }}</ref> Many organizations run continuous monitoring programs. Monitoring programs set out instruments at fixed stations on [[Weather buoy|buoys]], moorings, and docks throughout the bay to record things like temperature, [[salinity]], [[Chlorophyll|chlorophyll-a]] concentration, [[Oxygen saturation|dissolved oxygen]], and [[turbidity]] over time.<ref name="CBIBS">{{cite web | title=Chesapeake Bay Interpretive Buoy System | website=Home | date=23 December 2021 | url=https://buoybay.noaa.gov/ | access-date=3 March 2022}}</ref><ref name="VIMS WQ">{{cite web | title=Water Quality Monitoring | website=Virginia Institute of Marine Science | url=https://www.vims.edu/cbnerr/monitoring/water_quality/index.php | access-date=3 March 2022}}</ref><ref name="Eyes on the Bay">{{cite web |title=Eyes on the Bay: Your home for Maryland tidal water quality data, downloads and visualizations |publisher=MDNR |date=22 February 2022 |url=http://eyesonthebay.dnr.maryland.gov/eyesonthebay/index.cfm}}</ref>

Organizations actively collecting data in the Chesapeake Bay include, but are not limited to:
*[[Chesapeake Bay National Estuarine Research Reserve (Maryland)|Chesapeake Bay National Estuarine Research Reserve in Maryland]]
*[[Chesapeake Bay National Estuarine Research Reserve (Virginia)|Chesapeake Bay National Estuarine Research Reserve in Virginia]]
*[[Chesapeake Bay Program]]
*Hampton Roads Sanitation District
*[[Maryland Department of Natural Resources]]
*[[Goddard Space Flight Center]] (GSFC), Ocean Biology group
* GSFC Applied Sciences group (Water Resources and Human Health areas)
*[[National Oceanic and Atmospheric Administration|NOAA]] Chesapeake Bay Office
*[[Old Dominion University]]'s Earth and Ocean Sciences Department
*[[Smithsonian Environmental Research Center]]
*[[United States Geological Survey]]
*[[University of Maryland Center for Environmental Science]]
*[[Virginia Department of Environmental Quality]]
*[[Virginia Department of Health]]
*[[Virginia Institute of Marine Science]]
*[[Virginia Marine Resources Commission]]

== Underwater archaeology ==
In 1988, the Maryland Maritime Archeology Program (MMAP) was established to manage and explore various underwater archaeological. This was in response to the [[Abandoned Shipwrecks Act|National Abandoned Shipwreck Act]] passed in 1987, which gave ownership of historically significant shipwrecks to those states with proper management programs.<ref>{{Cite web |title=Maryland Maritime Archaeology Program |publisher=Maryland Historical Trust |location=Crownsville, MD |url=https://mht.maryland.gov/Pages/archaeology/archaeology-underwater.aspx |access-date=February 25, 2025}}</ref>

=== Location and research processes ===
The Chesapeake Bay watershed has been heavily impacted by natural forces such as erosion, tides, and a history of hurricanes and other storms. Along with environmental factors, the bay has been negatively impacted by humans since being settled in the 17th century, bringing with them problems like pollution, construction, destruction of the environment, and currently poultry farms. All of these circumstances have made it increasingly difficult for the MMAP to identify potential underwater archaeological sites. As sea levels rise and historically significant areas are sunk and covered in sediment, the MMAP relies on various pieces of equipment to locate these man-made anomalies but also ensure that the material being examined is kept intact. Using marine magnetometers (detects iron/absent space), [[side-scan sonar]] (detects objects on sea floor), along with precise global positioning systems, Langley and the MMAP have been much more successful in locating submerged archaeological sites. After locating the site, Langley and her team have a strict process in order to preserve the site and its contents, allowing more accurate and thorough research to be conducted. The remains of nearly every site have been submerged in saltwater for sometimes centuries, the integrity of shipwrecks and other materials are fragile and careful precaution must be used when working with them. Taking photos and videos, creating maps, and constructing models are all a part of the process of preserving remains. Susan Langley notes herself, "If you have only ten percent of a ship's hull, you can reconstruct the ship. Construction techniques can tell us about the people who built the vessels, artifacts can tell us about the people who profited from the ship's trade, and eco-facts—evidence of insect infestation and organic remains, such as seeds, that are preserved in anaerobic, muddy environments—can tell us about the climate and season when a ship sank."<ref>{{Cite web |last=Lewis |first=Nancy Breslau |title=Underwater Archaeology: History From the Deep |website=Inside Annapolis |publisher=Backyard Publications, LLC |url=http://www.insideannapolis.com/archive/2006/issue4/underwater.html |date=2006 |access-date=2020-11-16}}</ref> Still, the MMAP makes it a point to publish their data and information once a site is officially identified; however, the details of the location are left out to sway would-be looters, who have plagued marine archaeologists for decades.

=== Significant sites ===
Altogether there are more than 1,800 ship and boat wrecks that scatter the bottom of the Chesapeake Bay and its surrounding waterways.<ref>{{Cite web |title=Shipwrecks |url=https://www.chesapeakebay.net/discover/history/shipwrecks#:~:text=More%20than%201,800%20vessels%20have,and%20traveled%20on%20the%20Chesapeake. |access-date=2020-11-16 |publisher=Chesapeake Bay Program |archive-date=2020-04-16 |archive-url=https://web.archive.org/web/20200416155605/https://www.chesapeakebay.net/discover/history/shipwrecks#:~:text=More%20than%201,800%20vessels%20have,and%20traveled%20on%20the%20Chesapeake. |url-status=dead }}</ref> Dozens of precolonial era canoes and artifacts have been extracted from the bay, helping to portray a better picture of the lives of Native Americans (e.g., [[Powhatan]], [[Pamunkey]], [[Nansemond]]) In 1974, scallop fishermen dredged up the skull of a prehistoric [[mastodon]], which through carbon dating was found to be 22,000 years old. Along with the skull, a carved blade was also discovered in the same area. Unable to accurately carbon date the stone tool, archaeologists looked at similar styles of blade carving in order to gauge when it was made. The technique was similar to the [[Solutrean]] tools that were crafted in Europe between 22,000 and 17,000 years ago and it was noted that the stone tool must be at least 14,000 years old. The [[Solutrean hypothesis]] challenges the previous theory regarding the first inhabitants of North America, whereas it is commonly accepted amongst anthropologists that the [[Clovis culture|Clovis]] people were the first to settle the region somewhere around 13,000 years ago. There is some controversy surrounding these findings; many anthropologists have disputed this, claiming that the environment and setting make properly identifying the origins of these artifacts nearly impossible.<ref>{{Cite web |first=Tia |last=Ghose |title=Fisherman Pulls Up Beastly Evidence of Early Americans |url=https://www.livescience.com/47289-mastodon-found-under-chesapeake-bay.html |date=2014-08-11 |website=Live Science |publisher=Future US, Inc. |location=New York}}</ref>

The [[Chesapeake Bay Flotilla]], which was constructed using shallow barges and ships to counter British naval attacks during the [[War of 1812]]. After holding strong for some months, the British eventually defeated the flotilla and dozens of these vessels were burnt and sunk. Starting in 1978, there were numerous expeditions launched in hopes of successfully discovering what was left of the Chesapeake Bay Flotilla. Since then, hundreds of artifacts and remains have been extracted from the submerged ships such as weapons, personal items, and many other objects. Underwater archaeologists have also been successful in constructing accurate models and maps of the wreckage amongst the sea floor.<ref>{{Cite web |title=Chesapeake Flotilla |url=https://www.history.navy.mil/content/history/nhhc/research/underwater-archaeology/sites-and-projects/ship-wrecksites/chesapeakeflotilla1812.html |access-date=2020-11-16 |website=Naval History and Heritage Command |publisher=U.S. Navy |location=Washington, D.C.}}</ref>

In October 1774, the British merchant brig ''[[Peggy Stewart (ship)|Peggy Stewart]]'' arrived at the port of [[Annapolis, Maryland|Annapolis]] loaded with tea disguised as linens and garments. The tea was hidden by the ship's crew to avoid conflict with local colonists as the recently imposed tea tax had created hostility and uncertainty in the colonies. The crew of ''Peggy Stewart'' informed the colonists of the new taxes for the purchased tea. The colonists refused to pay the tax and after a few days of public meetings, the colonists decided to burn ''Peggy Stewart'' and the contents of it. The brig was burnt to the waterline in what became known as the 'Annapolis Tea Party' and has since become an important site for underwater archaeologists in the Chesapeake Bay.<ref>{{Cite web |title=Digging into Underwater Archaeology |url=https://www.archaeologyincommunity.com/digging-into-underwater-archaeology/ |publisher=Archaeology in the Community |location=Washington, D.C. |date=2016-07-27 |access-date=2020-11-16 |archive-date=2016-11-13 |archive-url=https://web.archive.org/web/20161113164017/http://www.archaeologyincommunity.com/digging-into-underwater-archaeology/ }}</ref> In 1949, after the Nazi's defeat in World War 2, the United States seized a [[German submarine U-1105|German U-1105]] built with sonar-evading rubber sheathing for study purposes. It was sunk the same year in the Potomac River off of the Chesapeake Bay following a high explosives test hosted by the U.S. Navy and has since been a popular site for underwater archaeologists.<ref>{{Cite web |title=State Submerged Resources: Maryland |department=Archeology Program |publisher=National Park Service |location=Washington, D.C. |url=https://www.nps.gov/archeology/sites/statesubmerged/maryland.htm |archive-url=https://web.archive.org/web/20100830163149/http://www.nps.gov/archeology/sites/stateSubmerged/maryland.htm |archive-date=August 30, 2010 |access-date=2020-11-16}}</ref>

Maryland has controlled the majority of underwater archaeology research around the Chesapeake Bay; however, Virginia's Department of Historic Resources has had a State Underwater Archaeologist since the 1970s. In 1982, the Virginia Department of Historic Resources along with the first State Underwater Archaeologist, John Broadwater, led an expedition to explore and research a sunken fleet of Revolution-era battleships. In September 1781, during the Revolutionary War, the British scuttled more than a dozen ships in the [[York River (Virginia)|York River]], near the mouth of the Chesapeake Bay. Under the ultimate command of [[Charles Cornwallis, 1st Marquess Cornwallis|Lord Cornwallis]], a group of British ships was pushed back towards the rivers of the Chesapeake, and to avoid them from falling into French and Spanish hands, Cornwallis began ordering them to be scuttled with the hopes of stalling the incoming Franco-American forces. Cornwallis was eventually forced to surrender on October 19 and the ships along with its contents were at the bottom of the York River. One of the British ships, ''Betsy'', has been explored more than any other and over 5,000 relics were removed from Betsy on their original expedition in 1982, including weapons, personal objects, and some valuable metals. Broadwater and his team were awarded a 20-page article in the magazine ''[[National Geographic]]'' for their findings. Virginia has recently been granted funding for further research of these sunken vessels and expeditions are currently underway with the goal to fully explore the scuttled ships. Unfortunately, following the publicity of these sunken ships, many divers have taken it upon themselves to explore the wreckage for 'treasure'.<ref>{{Cite news |last=Kimberlin |first=Joanne |title=Revolutionary War shipwrecks near Yorktown getting their first good look in years |url=https://www.pilotonline.com/history/article_ba8743b4-78a3-11e9-9710-ff054b373b72.html |date=2019-05-18 |work=The Virginian-Pilot |location=Norfolk, VA}}</ref>

==Publications==
There are several magazines and publications that cover topics directly related to the Chesapeake Bay and life and tourism within the bay region:
*The ''Bay Journal'' provides environmental news for the Chesapeake Bay watershed region.<ref name="Bay Journal">{{cite web | title=Bay Journal: Independent environmental news for the Chesapeake region | website=Bay Journal | url=https://www.bayjournal.com/ | access-date=23 February 2022}}</ref>
*''Bay Weekly'' is the Chesapeake Bay region's independent newspaper.<ref>{{Cite web|url=https://bayweekly.com/|title=Bay Weekly -|website=Bay Weekly}}</ref>
*''[[The Capital]]'', a newspaper based in Annapolis, reports about news pertaining to the Western Shore of Maryland and the Annapolis area.<ref>{{Cite news |access-date=April 22, 2011 |url=http://www.hometownannapolis.com/cgi-bin/read/TOP.html |title=Top Stories |newspaper=The Capital Newspaper |publisher=[[Capital Gazette Communications]] |archive-url=https://web.archive.org/web/20090208051821/http://hometownannapolis.com/cgi-bin/read/TOP.html |archive-date=February 8, 2009}}</ref> 
*''[[Chesapeake Bay Magazine]]'' and ''PropTalk'' focus on powerboating in the bay,<ref>{{Cite web |access-date=April 22, 2011 |url=http://www.chesapeakeboating.net |title=Chesapeake Bay Magazine}}</ref><ref>{{Cite news |access-date=April 22, 2011 |url=http://www.proptalk.com |title=PropTalk |publisher=PropTalk Media LLC |archive-url=https://web.archive.org/web/20110501075156/http://www.proptalk.com/ |archive-date=May 1, 2011 }}</ref> and ''SpinSheet'' focuses on sailing.<ref>{{Cite news |access-date=April 22, 2011 |url=http://www.spinsheet.com/ |title=SpinSheet |publisher=SpinSheet Publishing Co.}}</ref>
*''What's Up'' Magazine is a free monthly publication with special issues focused on Annapolis and the Eastern Shore.<ref name="Whats Up?">{{cite web | title=Annapolis Magazine – Eastern Shore Magazine – West County Magazine | website=What's Up? Media | date=21 February 2022 | url=https://whatsupmag.com/ | access-date=23 February 2022}}</ref>

==Cultural depictions==
===In literature===
* ''[[Beautiful Swimmers: Watermen, Crabs and the Chesapeake Bay]]'' (1976), a [[Pulitzer Prize]]-winning non-fiction book by [[William W. Warner]] about the Chesapeake Bay, blue crabs, and watermen.
* ''[[Chesapeake (novel)|Chesapeake]]'' (1978), a novel by author [[James A. Michener]].
*''Chesapeake Requiem: A Year with the Watermen of Vanishing Tangier Island'' (2018), by [[Earl Swift]], a New York Times bestselling nonfiction book about the crabbing community of the Chesapeake Bay.<ref>{{Cite news|title='Chesapeake Requiem' Chronicles Life on an Endangered Island|url=https://www.npr.org/2018/08/27/640347154/chesapeake-requiem-chronicles-life-on-an-endangered-island|access-date=2021-07-03|publisher=NPR|date=27 August 2018|language=en|last1=Mayer|first1=Petra}}</ref>
* ''[[Dicey's Song]]'' (1983) and the rest of [[Cynthia Voigt]]'s Tillerman series are set in [[Crisfield]] on the Chesapeake Bay.* [[John Barth]] wrote two novels featuring the Chesapeake Bay
* ''[[Jacob Have I Loved]]'' (1980) by [[Katherine Paterson]], winner of the 1981 [[Newbery Medal]]. This is a novel about the relationship between two sisters in a waterman family who grow up on an island in the bay.
* ''[[Patriot Games]]'' (1987), in which protagonist Jack Ryan lives on the fictional Peregrine Cliffs overlooking the Chesapeake Bay, and  ''[[Without Remorse]]'' (1993), in which protagonist John Kelly (later known as [[John Clark (Tom Clancy character)|John Clark]] when he goes to work for the [[Central Intelligence Agency|CIA]]), lives on a boat and an island in the bay, both by [[Tom Clancy]].
* ''[[Red Kayak]]'' (2004) by [[Priscilla Cummings]] portrays class conflict between waterman people and wealthy newcomers.
*''[[Sabbatical: A Romance]]'' (1982) centered on a yacht race through the bay, and ''[[The Tidewater Tales]]'' (1987) detailed a married couple telling stories to each other as they cruise the bay, both novels by [[John Barth]].
*''The Oyster Wars of Chesapeake Bay'' (1997) by John Wennersten, on the [[Oyster Wars]] in the decades following the Civil War.<ref name="Wennersten">{{cite book | last=Wennersten | first=J. | title=The Oyster Wars of Chesapeake Bay | publisher=Eastern Branch Press | year=2007 | isbn=978-0-615-18250-6 | url=https://books.google.com/books?id=YK_4SNyufM0C | access-date=23 February 2022 }}</ref>

===In film===
* ''[[The Bay (film)|The Bay]]'', a 2012 [[found footage (pseudo-documentary)|found footage]]-style eco-horror movie about a [[pandemic]] due to deadly pollution from chicken factory farm run-off and mutant [[isopods]] and aquatic parasites able to infect humans.
* ''Expedition Chesapeake, A Journey of Discovery'', a 2019 film starring [[Jeff Corwin]] created by The [[Whitaker Center for Science and the Arts]].<ref name="Expedition Chesapeake">{{cite web | title=Expedition Chesapeake | website=Expedition Chesapeake | url=https://www.expeditionchesapeake.org/ | access-date=23 February 2022 | archive-date=23 January 2022 | archive-url=https://web.archive.org/web/20220123071236/https://www.expeditionchesapeake.org/ }}</ref><ref name="Center Arts 2021">{{cite web | last1=Center | first1=Whitaker | last2=Arts | title=Expedition Chesapeake | publisher=Whitaker Center | date=21 July 2021 | url=https://www.whitakercenter.org/events/detail/expedition-chesapeake | access-date=23 February 2022 | archive-date=23 February 2022 | archive-url=https://web.archive.org/web/20220223174808/https://www.whitakercenter.org/events/detail/expedition-chesapeake }}</ref><ref name="YouTube 2022">{{cite web | title=Expedition Chesapeake Official Trailer | via=YouTube | date=23 February 2022 | url=https://www.youtube.com/watch?v=V3mrXHxXJlg | access-date=23 February 2022}}</ref>

===In TV===
* In ''[[Chesapeake Shores]]'', the O'Brien family lives in a small town in the bay, not far from Baltimore.
* In ''[[MeatEater]]'' by [[Steven Rinella]], Season 8, Episode 3–4 "Ghosts of the Chesapeake" features the Chesapeake Bay eastern shore.<ref name="Callaghan 2019">{{cite web | last=Callaghan | first=Ryan | title=Season 8, Episode 3 Gear: Ghosts of the Chesapeake | website=MeatEater Hunting | date=31 October 2019 | url=https://www.themeateater.com/hunt/big-game/season-8-episode-3-gear-ghosts-of-the-chesapeake | access-date=23 February 2022}}</ref>

===Other media===
* Singer and songwriter [[Tom Wisner]] recorded several albums, often about the Chesapeake Bay. ''[[The Boston Globe]]'' wrote that Wisner "always tried to capture the voice of the water and the sky, of the rocks and the trees, of the fish and the birds, of the gods of nature he believed still watched over it all."<ref name=twsT32/> He was known as the "Bard of the Chesapeake Bay."<ref name=twsT32>{{cite news |first=Jenna |last=Johnson |title= Tom Wisner; Chesapeake Bay served as bard's muse; at 79 |newspaper=[[The Boston Globe]] |date= April 9, 2010 |url=http://archive.boston.com/bostonglobe/obituaries/articles/2010/04/09/tom_wisner_chesapeake_bay_served_as_bards_muse_at_79/ |access-date= 20 April 2011 |publisher=The Boston Globe Media Partners, LLC}}</ref>
* The [[Atlanta, Georgia|Atlanta]]-based band [[Starbuck (band)|Starbuck]] referenced the Chesapeake Bay in their debut single, "[[Moonlight Feels Right]]", which reached the No. 3 position on the [[Billboard Hot 100|''Billboard'' Hot 100]] singles [[record chart|charts]] in 1976.<ref>{{cite web|author=[[Stephen Thomas Erlewine]] |url=http://www.allmusic.com/album/moonlight-feels-right-mw0000069061 |title=Moonlight Feels Right - Starbuck &#124; Songs, Reviews, Credits, Awards |publisher=AllMusic |date= |access-date=February 10, 2014}}</ref>
* The Chesapeake Bay is referenced in the hit musical ''[[Hamilton (musical)|Hamilton]]'', in the song "[[Yorktown (The World Turned Upside Down)]]." It describes the famous [[Battle of yorktown|Battle of Yorktown]], the last battle in the [[American Revolutionary War|Revolutionary War]]. When describing the US army's plan for attack, Hamilton sings: "When we finally drive the British away, Lafayette is there waiting in Chesapeake Bay!"

==See also==
{{Portal|Geography|Water}}
* [[Chesapeake Bay Interpretive Buoy System]]
* [[Chesapeake Bay Retriever]]
* [[Chesapeake Climate Action Network]]
* [[Chesepian]]
* [[Chessie (sea monster)]]
* [[Coastal and Estuarine Research Federation]]
* [[Great Ireland]]
* [[List of islands in Maryland]] (with the islands in the bay)
* [[National Estuarine Research Reserve]]
* [[Old Bay Seasoning]]

==Notes==
{{reflist|group=note}}

==References==
{{Reflist}}
{{Refbegin}}
* Cerco, C. F., Noel, M. R. (2007). Can oyster restoration reverse cultural eutrophication in Chesapeake Bay? Estuaries and Coasts, 30(2): 331–343.
* Cornwell, J. C., Conley, D. J., Owens, M., Stevenson, J. C. (1996). A sediment chronology of the eutrophication of Chesapeake Bay. Estuaries, 19(2B): 486–499.
* Fisher, T. R., Hagy III, J. D., Boynton, W. R., Williams, M. R. (2006). Cultural eutrophication of the Choptank and Patuxent estuaries of Chesapeake Bay. Limnology and Oceanography, 51(1, part 2): 435–447.
* Kimmel, D, G., Boynton, W. R., Roman, M. R. (2012). Long-term decline in calanoid copepod Acartia tonsa in central Chesapeake Bay, USA: An indirect effect of eutrophication? Estuarine, Coastal, and Shelf Science, 101: 76–85.
* Kirby, M. X., Miller, H. M. (2005). Response of a benthic suspension feeder (Crassostrea virginica Gmelin) to three centuries of anthropogenic eutrophication in Chesapeake Bay. Estuarine, Coastal, and Shelf Science, 62:679–689.
* Long, W. C., Seitz, R. D., Brylawski, B. J., Lipicus, R. N. (2014). Individual, population, and ecosystem effects of hypoxia on a dominant benthic bivalve in Chesapeake Bay. Ecological Monographs, 84(2): 303–327.
* Officer, C. B., Biggs, R. B., Taft, J. L., Cronin, L. E., Tyler, M. A., Boynton, W. R. (1984). Chesapeake Bay anoxia: origin, development, and significance. Science, 223(4631): 22–27.
* Seliger, H. H., Boggs, J. A., Biggley, W. H. (1985).  Catastrophic anoxia in the Chesapeake Bay in 1984. Science, 228(4695): 70–73.
* Zimmerman, A. R., Canuel, E. A. (2002). Sediment geochemical records of eutrophication in the mesohaline Chesapekae Bay. Limnology and Oceanography, 47(4): 1084–1093.
{{Refend}}

==Further reading==
{{Refbegin}}
* Cleaves, E.T. et al. (2006). ''Quaternary geologic map of the Chesapeake Bay 4º x 6º quadrangle, United States'' [Miscellaneous Investigations Series; Map I-1420 (NJ-18)]. Reston, VA: U.S. Department of the Interior, U.S. Geological Survey.
* [https://web.archive.org/web/20140101055340/http://www.terrapinbayfishing.com/uploads/Chesapeake_Bay_Tides_and_Currents_Effects_on_Fishing.pdf Crawford, S.  2012.  Terrapin Bay Fishing.  Chesapeake Bay Tides and Currents]
* Meyers, Debra and Perrealt, Melanie (eds.) (2014). ''Order and Civility in the Early Modern Chesapeake.'' Lanham, MD: Rowman and Littlefield.
* Phillips, S.W., ed. (2007). ''Synthesis of U.S. Geological Survey science for the Chesapeake Bay ecosystem and implications for environmental management'' [U.S. Geological Survey Circular 1316]. Reston, VA: U.S. Department of the Interior, U.S. Geological Survey.
* Thomas, William G., III. [http://southernspaces.org/2004/chesapeake-bay "The Chesapeake Bay."] ''Southern Spaces'', April 16, 2004.
* William W. Warner, ''Beautiful Swimmers'', about the history, ecology and anthropology of the Chesapeake Bay, published 1976
* Sturdivant, S. K., Diaz, R., Llanso, R., Dauer, D. (2014). Relationship between hypoxia and macrobenthic production in Chesapeake Bay. Estuaries and Coasts. 37(5). DOI:10.1007/s12237-013-9763-4.
{{Refend}}

==External links==
{{Wikivoyage}}
{{Commons category}}
* [https://www.nps.gov/locations/chesapeakebaywatershed/index.htm Chesapeake Bay History & Culture, U.S. National Park Service]
* [https://www.chesapeakebay.net/ Chesapeake Bay Program]
* [http://www.umces.edu/ University of Maryland Center for Environmental Science] Research and science application activities emphasizing Chesapeake Bay and its watershed.

{{Maryland}}
{{Virginia}}
{{Maryland waters}}
{{List of seas}}
{{Ramsar sites in the United States}}

{{Authority control}}

[[Category:Chesapeake Bay| ]]
[[Category:Chesapeake Bay watershed|01]]
[[Category:Environment of the Mid-Atlantic states]]
[[Category:Estuaries of Maryland]]
[[Category:Estuaries of Virginia]]
[[Category:Intracoastal Waterway]]
[[Category:Marine ecoregions]]
[[Category:Ramsar sites in the United States]]
[[Category:Estuaries of the United States]]
[[Category:Eutrophication]]