The Interstate Highways in Arizona are the segments of the Dwight D. Eisenhower System of Interstate and Defense Highways that are owned and maintained by the U.S. state of Arizona, totaling about 1,169 miles (1,881 km).[1] Arizona has a total of six Interstate Highways, all of which are mainline highways; there are no auxiliary highways. The longest Interstate in Arizona is Interstate 10 (I-10), which traverses east-west through the southern and central parts of the state, serving Phoenix. There are also a total of fourteen active business routes and eight former routes, which were either business loops or spurs for all main highways except I-15. All of Arizona's existing Interstate Highways have overtaken or replaced some U.S. Routes, which either involved decommissioning or running concurrent with the existing route.
The Interstate Highway System currently covers 1,169 miles (1,881 km) of interstate highway in Arizona, which only consists of primary highways, which are the two-digit routes and I-8. There are no auxiliary interstates within the state, which are three-digit routes. The only auxiliary Interstate that has existed in Arizona was I-410, which was an inner loop route in Phoenix. It later became part of I-10 as I-10 was rerouted and the old route became part of I-17. The longest Interstate in Arizona is I-10, which spans 392.33 miles (631.39 km)[1] across southern and central Arizona, and the shortest Interstate is I-15, which only traverses the northwestern corner of the state, running from Nevada to Utah, spanning only 29.39 miles (47.30 km). I-11 is a proposed Interstate that is currently in its planning phase and is expected to run from the Hoover Dam to Nogales. It is planned to overtake U.S. Route 93 (US 93).
There are also 14 active business routes within the state. All current Interstate Highways have had business routes except for I-15, which never had a business route designated. I-17's only business route located in Black Canyon City was decommissioned in 2011, joining I-15 as the only two routes without a business route.
Proposed, but it never materialized; what would have been I-710 became today's Kino Parkway.
Former
Proposed and unbuilt
Business routes
All state designated Interstate Business Loops are internally designated as State Route Business Loops by ADOT, being referred to throughout ADOT ArcGIS data and state highway logs as such.[11] For example, all currently state designated I-10 Business Loops in Arizona are referred to as "SB010" which is the Arizona Transportation Information System (ATIS) code for "State Business Route 10" or "SR 10B" for short.[11][12]
^ abcdeArizona Department of Transportation (December 15, 1999). "1998 State Highway System Log"(PDF). Arizona Department of Transportation. Retrieved June 10, 2019.
^ ab"NETRonline: Historic Aerials - Viewer". NETR Online. Tempe, Arizona: Nationwide Environmental Title Research, LLC. September 10, 2018. Retrieved September 10, 2018.
^Arizona Department of Transportation. "ADOT Right-of-Way Resolution 1992-08-A-056". Arizona Department of Transportation. Retrieved October 18, 2018. RENUMBER U.S. 89 FROM JCT WITH I-19 NEAR GREEN VALLEY TO I-10 IN TUCSON
^Arizona Department of Transportation. "ADOT Right-of-Way Resolution 2004-03-A-009". Arizona Department of Transportation. Retrieved October 18, 2018. Abandon B-19 (old 89) from Duval Mine Road going north to Los Reales Road; Portion goes to Pima County, portion goes to the Town of Sahuarita; PR: 9-9-27, p. 26; + various; and 92-08-A-56.
^Multimodal Planning Division, Roadway Inventory Staff (December 31, 2009). "2009 State Highway System Log"(PDF). Arizona Department of Transportation. Retrieved June 5, 2019.
^ abArizona Department of Transportation (December 31, 2007). "2007 State Highway System Log"(PDF). Arizona Department of Transportation. Retrieved June 5, 2019.
^Arizona Department of Transportation (December 31, 2005). "2005 State Highway System Log"(PDF). Arizona Department of Transportation. Retrieved June 5, 2019.
^Transportation Planning Division, Data Bureau Staff (December 31, 2006). "2006 State Highway System Log"(PDF). Arizona Department of Transportation. Retrieved June 5, 2019.