Arizona State Routes
Formed in 1927, Arizona's State Highway Commission was assigned the duty of adopting and designating state routes and US Highways. Arizona adopted 1,954 miles in the first year spread across 17 different routes, but there were many gaps in the highway system. Within a decade, the gaps had been filled, signs had been posted and maps made.
In the 1950's, Arizona's first freeway - the Black Canyon Freeway - was built and signed as part of SR 69. This was later certified as an Interstate and was given the number I-17, which replaced SR 69 not only along the Black Canyon Freeway, but as far north as the Cordes Junction. Arizona was able to get a jump start on the building of freeways, and had a sprawling network of Interstates, US Highways, and State Routes by the 1990's. Improvements and new building continue on, including the recently completed South Mountain Freeway (SR 202L) and the planned SR 30 freeway.
In the 1950's, Arizona's first freeway - the Black Canyon Freeway - was built and signed as part of SR 69. This was later certified as an Interstate and was given the number I-17, which replaced SR 69 not only along the Black Canyon Freeway, but as far north as the Cordes Junction. Arizona was able to get a jump start on the building of freeways, and had a sprawling network of Interstates, US Highways, and State Routes by the 1990's. Improvements and new building continue on, including the recently completed South Mountain Freeway (SR 202L) and the planned SR 30 freeway.
Archived Roads.
- State Route 51 - Piestewa Fwy. Originally Squaw Peak Pkwy, the city of Phoenix started construction in 1986 on the center segment with ADOT doing the north segment in 1988. It was handed over in 1992 to ADOT. Planned in 1955 as I-510, it was adopted as SR 510 in 1968 and renumbered to SR 51 in 1987.
- State Route 77 -
- State Route 83 -
- State Route 89 -
- State Route 101 - Agua Fria, Pima and Price Freeways. Originally SR 417 and 117, it was also supposed to include the South Mountain Freeway before being truncated back to ending in Chandler. Loop 101 was built between 1987 and 2001.
- State Route 202 - Red Mountain, Santan and South Mountain Freeways were completed between 1990 and 2019 in the East Valley. They were originally SR 216, 217, 218, and 220 before being unified under the Loop 202 banner.
- State Route 238 -
- State Route 287 -
- State Route 303 - Bob Stump Memorial Pkwy/Estrella Fwy. The current outer loop, running from I-17 in Phoenix to I-10 in Goodyear. It was dropped from plans in 1995 when Maricopa County took up the project and built a two-lane road from I-10 to Happy Valley. ADOT Later readopted the highway in 2004 and was rebuilt thru 2017 as a freeway, albeit interim in some locals. Plans call for it to extend to I-8 near Casa Grande by 2030.
- State Route 347 -
- Former State Route 989 -
