View source for Missouri Route 100

{{Short description|State highway in Missouri, United States}}
{{Use mdy dates|date=January 2025}}

{{Infobox road
|state=MO
|type=Route
|route=100
|map={{maplink|frame=yes|plain=yes|frame-align=center|frame-width=290|frame-height=240|type=line|raw={{Wikipedia:Map data/Wikipedia KML/Missouri Route 100}}}}
|map_custom=yes
|map_notes=Route&nbsp;100 highlighted in red
|established=
|length_mi=121.144
|length_ref=<ref name="MoDOT"/>
|direction_a=West
|terminus_a={{Jct|state=MO|US|50}} in [[Linn, Missouri|Linn]]
|junction=
*{{jct|state=MO|I|44|US|50}} in [[Gray Summit, Missouri|Gray Summit]]
*{{jct|state=MO|I|270}} in [[Des Peres, Missouri|Des Peres]]
*{{jct|state=MO|US|61|US|67}} near [[Kirkwood, Missouri|Kirkwood]]
|direction_b=East
|terminus_b=Chouteau Avenue at the [[Interstate 44 in Missouri|I-44]] / [[Interstate 55 in Missouri|I-55]] overpass in [[St. Louis, Missouri|St. Louis]]
|counties=[[Osage County, Missouri|Osage]], [[Gasconade County, Missouri|Gasconade]], [[Franklin County, Missouri|Franklin]], [[St. Louis County, Missouri|St. Louis]], [[St. Louis City]]
|previous_type=MO
|previous_route=99
|next_type=MO
|next_route=101
}}

'''Route 100''', also named '''Manchester Road''' through [[St. Louis County, Missouri|St. Louis County]] and '''Manchester Avenue''' and '''Chouteau Avenue''' through [[St. Louis City]], is a [[state highway]] in the [[U.S. state]] of [[Missouri]]. It runs from [[Linn, Missouri]] at [[U.S. Route 50 (Missouri)|U.S. Route 50]] to [[Interstate 55 in Missouri|Interstate 55]] in [[St. Louis, Missouri|St. Louis]]. The highway is {{convert|121|mi|km}} long.

==Route description==
Route 100 begins at [[U.S. Route 50 (Missouri)|US 50]] in [[Linn, Missouri|Linn]]. The highway heads north from Linn until it encounters the [[Missouri River]], where it turns eastward to parallel the river. At [[Chamois, Missouri]], it serves as the northern terminus of [[Route 89 (Missouri)|Route 89]]. It then enters [[Gasconade County, Missouri|Gasconade County]] near [[Morrison, Missouri|Morrison]] and bridges the [[Gasconade River]] near its mouth at the [[Gasconade, Missouri|eponymous town]]. In the county seat, [[Hermann, Missouri|Hermann]], Route 100 has a short [[concurrency (road)|concurrency]] with [[Route 19 (Missouri)|Route 19]]. The highway passes through [[New Haven, Missouri|New Haven]], in [[Franklin County, Missouri|Franklin County]], {{convert|14|mi|km}}<ref name="modot-2007-map">{{cite map|publisher=Missouri Department of Transportation|title=Official Highway Map|edition=2007-2008}}</ref> later. The highway then intersects [[Route 185 (Missouri)|Route 185]] at its northern terminus, and [[Route 47 (Missouri)|Route 47]] in [[Washington, Missouri|Washington]]. It becomes an [[Limited-access road|expressway]] outside the city limits, which runs to near [[Gray Summit, Missouri|Gray Summit]]. Route 100 crosses over [[Interstate 44 in Missouri|Interstate 44]] two times, with an interchange providing access to the freeway.

Northeast of Gray Summit, Route 100 crosses into [[St. Louis County, Missouri|St. Louis County]], entering the city limits of [[Wildwood, Missouri|Wildwood]] at the same time. Just north of the intersection with Route T, the highway becomes an expressway again. In Wildwood, it has an interchange with [[Route 109 (Missouri)|Route 109]]. Route 100 then enters [[Ellisville, Missouri|Ellisville]], where the expressway ends. From here all the way into St. Louis, the highway also carries the local name Manchester Road. In Ellisville, [[Route 340 (Missouri)|Route 340]] (Clarkson Road) meets its southern terminus. Route 100 then proceeds into [[Ballwin, Missouri|Ballwin]]. It then divides [[Manchester, Missouri|Manchester]] from [[Winchester, Missouri]] before wholly entering Manchester, where it has a [[single-point urban interchange]] (SPUI) with [[Route 141 (Missouri)|Route 141]]. Route 100 then runs through a swath of unincorporated territory en route to [[Des Peres, Missouri|Des Peres]]. The route crosses over [[Interstate 270 (Missouri)|Interstate 270]], the St. Louis beltway, in that town. East of Ellisville, Route 100 enters [[Kirkwood, Missouri|Kirkwood]]; there, Manchester Road intersects Kirkwood Road (the name given to [[Lindbergh Boulevard]] in Kirkwood), which carries [[U.S. Route 61 (Missouri)|US 61]]/[[U.S. Route 67 (Missouri)|67]]. Route 100 then passes through the smaller suburbs of [[Warson Woods, Missouri|Warson Woods]], [[Glendale, Missouri|Glendale]], [[Rock Hill, Missouri|Rock Hill]], [[Brentwood, Missouri|Brentwood]], and [[Maplewood, Missouri|Maplewood]].

After leaving Maplewood, Route 100 continues into the independent [[St. Louis, Missouri|City of St. Louis]] where the name changes from "Manchester Road" to "Manchester Avenue." As Manchester Avenue crosses Vandeventer Avenue, the highway becomes Chouteau Avenue. Route 100 continues east on Chouteau Avenue towards [[Downtown St. Louis]]. The route ends just east of South Broadway, at the [[Interstate 55 in Missouri|Interstate 55]] overpass. Due to the nearby east terminus of I-44, there is no interchange with I-55 at the state route's terminus.

==The Lewis and Clark Trail==
Most of Route 100 is part of the [[Lewis and Clark Trail]]. From Kirkwood Rd in Kirkwood to three miles (5&nbsp;km) west of Wildwood is one section, where the trail turns off on Route T. Route T will eventually end, once again, at Route 100 northwest of I-44 and continue down Route 100 all the way to five miles (8&nbsp;km) north of Linn (where Route 100 ends), and the Lewis and Clark Trail turns off onto Route C.

==History==
{{Multiple issues|section=yes|
{{Expand section|date=June 2008}}
{{Unreferenced section|date=August 2025}}
}}
Much of the road between [[St. Louis, Missouri|St. Louis]] and [[Gray Summit, Missouri|Gray Summit]] was the original [[U.S. Route 66 (Missouri)|U.S. Route 66]], though this was only temporary until US 66 moved to its later location at what is now Watson Rd ([[Missouri Route 366|Route 366]]) and [[Interstate 44 (Missouri)|Interstate 44]]. During, and after US 66 was moved off Manchester Rd, the road remained part of [[U.S. Route 50 (Missouri)|U.S. Route 50]] for many years.

==Major intersections==
{{jcttop|state=MO|length_ref=<ref name="MoDOT">{{MoDOT Flex|accessdate=August 29, 2015}}</ref>}}
{{MOint
|county=Osage
|cspan=3
|location=Linn
|mile=0.000
|road={{jct|state=MO|US|50|name1=Main Street|city1=Linn|city2=Loose Creek<!--I think this is what the sign says-->}}
}}
{{MOint
|type=concur
|location=Luystown<!--maybe-->
|mile=5.410
|road={{jct|state=MO|Supp|C|LCT|city1=Frankenstein}}
|notes=Western end of Lewis and Clark Trail overlap
}}
{{MOint
|location=Chamois
|mile=17.840
|road={{jct|state=MO|Route|89|city1=Linn}}
}}
{{MOint
|county=Gasconade
|cspan=2
|location=Hermann
|lspan=2
|road={{jct|state=MO|Route|19|name1=South Market Street|city1=Swiss}}
|mile=41.181
|type=concur
|notes=Western end of Route 19 overlap
}}
{{MOint
|road={{jct|state=MO|Route|19|name1=North Market Street}}<!--any cities signed?-->
|mile=41.895
|type=concur
|notes=Eastern end of Route 19 overlap
}}
{{MOint
|county=Franklin
|cspan=8
|location=none
|road={{jct|state=MO|Route|185|dir1=south|city1=Beaufort}}
|mile=62.301
}}
{{MOint
|location=Washington
|road={{jct|state=MO|Route|47|city1=Union|city2=Warrenton}}
|mile=70.379
}}
{{MOint
|type=concur
|location=none
|mile=76.957
|road={{jct|state=MO|Supp|T|county1=Franklin|dir1=east|Supp|V|county2=Franklin|dir2=west|LCT||dir3=east|city1=Labadie|city2=Union}}
|notes=Eastern end of Lewis and Clark Trail overlap
}}
{{MOint
|type=concur
|location=none
|mile=80.178
|road={{jct|state=MO|Supp|AT|county1=Franklin|dir1=west|US-Hist|66|dir2=west|to3=to|I|44|US|50}}
|notes=Western end of Historic US 66 overlap<!--is it signed here?-->
}}
{{MOint
|type=concur
|location=none
|mile=82.173
|road={{jct|state=MO|BL|44|dab1=Pacific|dir1=east|US-Hist|66|dir2=east}}<!--Historic US 66 splits here; Route 100 is the 1926-1933 route but lacks the banner in this area-->
|notes=Eastern end of Historic US 66 overlap; west end of I-44 Bus. / Historic US 66 (1926–1933) overlap
}}
{{MOint
|type=concur
|location=none
|road={{jct|state=MO|I|44|US|50|city1=St. Clair|city2=Pacific}}
|mile=82.218
|mile2=82.231
|notes=I-44 exit 253; east end of I-44 Bus. overlap
}}
{{MOint
|location=Gray Summit
|mile=82.692
|road={{jct|state=MO|Supp|MM|county1=Franklin|dir1=north|city1=Labadie}}
}}
{{MOint
|mile=88.046
|location=none
|road={{jct|state=MO|Supp|OO|county1=Franklin|dir1=south|city1=Pacific}}
}}
{{MOint
|type=concur
|county=St. Louis
|cspan=9
|location=Wildwood
|lspan=4
|mile=89.602
|road={{jct|state=MO|US-Hist|66|dab1=1926-1933|dir1=east|name1=Manchester Road}}<!--poorly signed here-->
|notes=Eastern end of Historic US 66 (1926–1933) overlap
}}
{{MOint
|type=concur
|mile=93.161
|road={{jct|state=MO|Supp|T|county1=Franklin|dir1=west|LCT||dir2=west|city1=St. Albans}}
|notes=Western end of Lewis and Clark Trail overlap
}}
{{MOint
|road={{jct|state=MO|Route|109|name1=Eatherton Road}}
|mile=95.798
|notes=Interchange
}}
{{MOint
|type=concur
|mile=97.319
|road={{jct|state=MO|US-Hist|66|dab1=1926-1933|dir1=west|name1=Manchester Road}}
|notes=Western end of Historic US 66 (1926–1933) overlap
}}
{{MOint
|location=Ellisville
|road={{jct|state=MO|Route|340|dir1=east|name1=Clarkson Road}}
|mile=99.042
}}
{{MOint
|location=Manchester
|road={{jct|state=MO|Route|141}}
|mile=103.221
|mile2=103.230
|notes=Interchange
}}
{{MOint
|location=Des Peres
|lspan=2
|mile=106.321
|road=Des Peres Road
|notes=Interchange
}}
{{MOint
|road={{jct|state=MO|I|270|location1=[[Chicago]]|location2=[[Memphis, Tennessee|Memphis]]}}
|mile=106.584
|mile2=106.598
|notes=I-270 exit 9
}}
{{MOint
|location=Kirkwood
|road={{jct|state=MO|US|61|US|67|LCT||dir3=east|US-Hist|66|dab4=1936-1965|name4=[[Kirkwood Road|North Kirkwood Road]]}}<!--http://www.jmcnews.com/missouri66/cmp/Volume_II_Cover_and_St._Louis_County.pdf p. 6 shows the various US 66 alignments-->
|mile=109.046
|notes=Eastern end of Lewis and Clark Trail overlap
}}
{{MOint
|type=concur
|indep_city=St. Louis
|lspan=4
|mile=114.582
|road={{jct|state=MO|US-Hist|66|dab1=1926-1933|dir1=east|name1=McCausland Avenue}}
|notes=Eastern end of Historic US 66 (1926–1933) overlap
}}
{{MOint
|type=concur
|mile=117.655
|road={{jct|state=MO|US-Hist|66|dab1=1926-1933|dir1=west|name1=Boyle Avenue}}<!--signage here is not too good, and I don't know if it's even historically accurate - 1920s officials show McCausland-Clayton-Boyle, not Lindell-->
|notes=Western end of Historic US 66 (1926–1933) overlap
}}
{{MOint
|type=concur
|mile=120.674
|road={{jct|state=MO|US-Hist|66|name1=Tucker Boulevard}}
|notes=Eastern end of Historic US 66 (1926–1933) overlap
}}
{{MOint
|mile=121.144
|road=3rd Street
|notes=Eastern end of state maintenance (under [[I-44 (MO)|I-44]] / [[I-55 (MO)|I-55]])
}}
{{jctbtm|keys=concur}}

==See also==
{{portal|U.S. Roads|Missouri}}
* [[List of state highways in Missouri]]


==References==
{{reflist|22em}}

==External links==
{{Attached KML|display=title,inline}}
{{commons category-inline|Missouri Route 100}}


{{authority control}}


[[Category:State highways in Missouri|100]]
[[Category:U.S. Route 66 in Missouri|100]]
[[Category:Streets in St. Louis]]
[[Category:U.S. Route 50]]
[[Category:Transportation in Osage County, Missouri]]
[[Category:Transportation in Gasconade County, Missouri]]
[[Category:Transportation in Franklin County, Missouri]]
[[Category:Transportation in St. Louis County, Missouri]]