Interstate 17
Template:Short description Template:Use American English Template:Use mdy dates Template:Infobox road
Interstate 17 (I-17) is a north–south Interstate Highway located entirely within the US state of Arizona. I-17's southern terminus lies in Phoenix, at I-10/US 60 and its northern terminus is in Flagstaff, at I-40.<ref name="ADOT NHS Map"/>
Most of I-17 is known as the Arizona Veterans Highway. In the Phoenix metropolitan area, it is mostly known as the Black Canyon Freeway, however, the southern Template:Convert are part of the Maricopa Freeway. The portion of the highway south of Cordes Lakes was built along the alignment of State Route 69 (SR 69), while the northern part was built along old SR 79's alignment. The final section of I-17 was completed in 1978.
I-17 gains more than Template:Convert in elevation between Phoenix at Template:Convert and Flagstaff at Template:Convert. The highway features several scenic view exits along its route that overlook the many mountains and valleys in northern Arizona.
Route description
I-17 is known as the Black Canyon Freeway from the northern end of the Phoenix Metropolitan Area to a point Template:Convert south of The Stack interchange with I-10 northwest of Downtown Phoenix. (It is accompanied by frontage roads for most of this portion, and they carry the Black Canyon Highway name to distinguish from the freeway status.) At the Durango Curve southwest of downtown, between the 19th Avenue and Buckeye Road interchanges, it picks up the designation Maricopa Freeway all the way to the southern terminus at the second I-10 junction. It is one of the metropolitan area's primary freeways.<ref name="ADOT Highway Log">Template:ADOT log</ref><ref name="Google"/> It has two interchanges with I-10 in Phoenix.<ref name="Google">Template:Google maps</ref>
The northern portion of the B Line of the Valley Metro Rail system runs over a bridge of I-17 from Mountain View Road to Metro Parkway, serving one station at Metro Parkway.
I-17 ends at I-40 and SR 89A (Milton Road) in Flagstaff.
-
"The Stack", intersection of I-10 and I-17. Looking north up I-17, downtown Phoenix. -
-
View of the Red Rocks of Sedona from I-17, just south of Munds Park -
I-17 near Flagstaff -
Northern terminus at I-40 as seen from I-40 in Flagstaff
.jpg)
History
The I-17 corridor roughly follows the first stagecoach route through the Black Canyon, established in 1878 between Cañon (now Black Canyon City) and Prescott. A later highway through White Spar from Wickenburg to Yarnell was improved in 1925 and incorporated into US 89 in 1926.<ref name="ADOTBlog-History">Template:Cite news</ref>
In 1936, SR 69 was established as a state route from Phoenix north to Prescott.<ref name="1938 map">Template:Cite map</ref><ref>Template:Cite web</ref> The road was completed by 1940 to Prescott. In 1954, a new route north to Flagstaff was established as SR 79. In May 1956, the Black Canyon Highway from Phoenix to Flagstaff was completed,<ref name="ADOTBlog-History"/> but not to Interstate standards.<ref name="1961 map">Template:Cite map</ref> It was incorporated into the new Interstate Highway System, established by the federal government later that year, and designated as part of I-17.<ref name="ADOTBlog-History"/>
The first interchange on the Black Canyon Freeway was built in 1950 west of downtown Phoenix and was extended to Grand Avenue in 1957.<ref name="AZ-First">Template:Cite news</ref><ref name="ADOTBlog-History"/> The freeway was extended to McDowell Road by 1971 and out of the Phoenix suburbs by 1974, at a cost of $33 million.<ref name="AZ-First"/> By 1971, I-17 had been completed from Phoenix northward to Camp Verde where a short stretch had not been completed to standards. The stretch from SR 279 (now SR 260) north to SR 179 was also complete. The largest section yet to be completed was from SR 179 north to Flagstaff. This segment was still just a two-lane roadway, but it did have full traffic interchanges built at crossroads. The portion from I-40 south to the Flagstaff Municipal Airport had been completed by this time.<ref name="1971 map">Template:Cite map</ref> The final section of I-17, near Camp Verde and Montezuma Castle, began construction in February 1977 and opened to traffic in August 1978.<ref name="ADOTBlog-History"/><ref>Template:Cite news</ref>
In 1993, officials in Arizona proposed an extension of I-17 to connect with I-15 in Utah.<ref>Template:Cite news</ref>Template:Clarify
The existing interchange with Happy Valley Road in Phoenix was converted to a diverging diamond interchange (DDI). The project was finished in the fall of 2020.<ref>Template:Cite web</ref>
Due to increasing weekend traffic on I-17 between the Phoenix area and northern Arizona, primarily between Phoenix in the south, and Sedona, Flagstaff, and the Grand Canyon in the north, ADOT started plans to widen a Template:Convert section of four-lane freeway between Anthem and the Sunset Point Rest Area in 2018.<ref name="improve">Template:Cite web</ref> In 2021, the design was chosen, with a standard third general-purpose lane set to be added in both directions between Anthem and Black Canyon City, but due to the mountainous topography north of Black Canyon City to Sunset Point, two flex lanes will be added in a separate carriageway next to the existing southbound lanes.<ref name="widening">Template:Cite web</ref> The lanes will be allocated depending on whichever direction has the most traffic, generally this will be northbound traffic from Monday through Saturday, and southbound traffic on Sundays. A combination of six different safety systems (vehicle arresting barriers, automated arm gates, concrete barriers, steel gates, dynamic messaging signs, and cameras) will control access to these lanes.<ref name="flex">Template:Cite web</ref> Construction began in 2022 and in May 2025, the additional lanes from Anthem to Black Canyon City opened.<ref name="abc memorial day">Template:Cite web</ref><ref name="adot memorial day">Template:Cite press release</ref> The flex lanes are scheduled to be completed by the end of 2025.<ref name="improve" /><ref name="girder">Template:Cite news</ref>
Exit list
Template:Jcttop Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:Jctbridge Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:AZint Template:Jctbtm
Former business route
State Business Route 17 (also known as SR 17 Bus.) was a former Template:Convert business loop of I-17 that served the west side of Black Canyon City, Arizona. SR 17 Bus. followed Old Black Canyon Highway (formerly SR 69 before I-17 replaced most of the route between Phoenix and Cordes Junction) from exit 242 south of town at a diamond interchange to another diamond interchange at exit 244 north of town. The business route was subsequently transferred from state to local maintenance and because of ADOT's policy of not signing business loops on nonstate maintained roadways, the route was decommissioned in 2011.Template:Cn
Major intersections
Template:Jcttop
Template:AZint
Template:AZint
Template:Jctbtm
Template:Clear