List of Interstate Highways in Arizona

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Interstate Highways of the Arizona State Highway System
System information
Maintained by ADOT
Length1,169.17 mi[1] (1,881.60 km)
Business Routes not included
Formed1957
Highway names
InterstatesInterstate nn (I-nn)
US HighwaysU.S. Route nn (US nn)
StateState Route nn (SR nn)
System links
  • Arizona State Highway System

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 Arizona Department of Transportation (ADOT) is the agency responsible for building and maintaining the Interstate Highways in the Arizona State Highway System. These highways are built to Interstate Highway standards, which are freeways that have a 75-mile-per-hour (121 km/h) speed limit in rural areas and a 65 mph (105 km/h) speed limit in urban areas.[2] The numbering scheme used to designate the Interstates was developed by the American Association of State Highway and Transportation Officials (AASHTO), an organization composed of various state departments of transportation in the United States.

Description

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 Interstate 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.

List

Number Length (mi)[1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-8 178.33 286.99 I-8 at the California state line I-10 in Casa Grande 01958-01-011958[3] current Replaced US 80 and SR 84
I-10 392.33 631.39 I-10 at the California state line I-10 at the New Mexico state line 01960-01-011960[4] current Replaced US 60, US 70, SR 93, SR 84, US 80 and SR 86
I-11 — — I-19 BL in Nogales I-11/US 93 at the Nevada state line proposed — Will replace U.S. Route 93 and I-19
I-15 29.39 47.30 I-15 at the Nevada state line I-15 at the Utah state line 01962-01-011962[5] current Replaced US 91
I-17 145.76 234.58 I-10 / US 60 in Phoenix I-40 in Flagstaff 01957-01-011957[6] current Replaced US 89, SR 79 and SR 69
I-19 63.35 101.95 I-19 BL in Nogales I-10 at Tucson 01963-01-011963[7] current Replaced US 89 and SR 93
I-40 359.48 578.53 I-40 at the California state line I-40 at the New Mexico state line 01962-01-011962[7] current Replaced US 66 and US 89
I-410 0.65[8] 1.05 I-10 in Phoenix Buckeye Road in Phoenix 01969-01-011969[9] 01971-01-011971[10] Renumbered I-10; former I-10 became an extended I-17.
I-510 0.65[8] 1.05 I-10 in Phoenix Buckeye Road in Phoenix 01958-01-011958[11] 01969-01-011969[9] Renumbered SR 51.
I-710 — — I-10 in Tucson I-10 in Tucson 01971-01-011971 01982-01-011982 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.[12] 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.[12][13]

Number Length (mi)[1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-8 Bus. 12.23 19.68 I-8 Bus. at the California state line I-8 east of Yuma 01966-01-011966 current Former US 80
I-8 Bus. 5.96 9.59 I-8 west of Gila Bend I-8 east of Gila Bend 01973-01-011973 current Former US 80 and SR 84
I-10 Bus. 2.91 4.68 I-10 west of Quartzsite I-10 east of Quartzsite 01974-01-011974 current Former US 60/US 70
I-10 Bus. — — I-10 at 27th Avenue in Phoenix I-10 at 48th Street in Phoenix — 01990-01-011990
I-10 Bus. 5.75 9.25 I-10 and Park Avenue in Tucson I-10 east of Tucson 01972-01-011972 02001-01-012001 Former US 80/SR 86
I-10 Bus. 3.51 5.65 I-10 west of Benson I-10 east of Benson 01974-01-011974 current Former US 80/SR 86
I-10 Bus. Spur 0.55 0.89 I-10 north of Benson I-10 BL in Benson 01969-01-011969 01999-01-011999 Ocotillo Road in Benson
I-10 Bus. 8.33 13.41 I-10 west of Willcox I-10 east of Willcox 01974-01-011974 current Former US 666/SR 86
I-10 Bus. 4.41 7.10 I-10 west of Bowie I-10 east of Bowie 01974-01-011974 current Former SR 86
I-10 Bus. 3.90 6.28 I-10 west of San Simon I-10 east of San Simon 01974-01-011974 current Former SR 86
I-17 Bus. 3.00 4.83 I-17 in Black Canyon City I-17 in Black Canyon City — 02011-01-012011 Former SR 69
I-19 Bus. 5.88 9.46 I-19 north of Nogales Fed. 15 at the Mexican border 01992-01-011992 current Former US 89/SR 93
I-19 Bus. 20.24 32.57 I-19 in Green Valley I-10 in South Tucson 01992-01-011992 02004-01-012004 Former US 89/SR 93
I-40 Bus. 3.73 6.00 I-40/U.S. Route 93 west of Kingman I-40/US 93 east of Kingman 01984-01-011984 02009-01-012009 Former US 66/US 93
I-40 Bus. 4.25 6.84 I-40 southwest of Seligman I-40 southeast of Seligman 01984-01-011984 current Section of the route is former US 66
I-40 Bus. 1.49 2.40 I-40 west of Ash Fork I-40/SR 89 east of Ash Fork 01984-01-011984 current Former US 66/US 89
I-40 Bus. 3.88 6.24 I-40 west of Williams I-40/SR 64 east of Williams 01984-01-011984 current Former US 66/US 89. Decommissioned as a state highway in 1990.
I-40 Bus. 9.67 15.56 I-40 west of Flagstaff I-40/US 180 in Flagstaff 01984-01-011984 current Former US 66/US 89
I-40 Bus. 0.87[14] 1.40 I-40 BL/US 180 in Flagstaff I-40/US 180 east of Flagstaff 01999-05-201999 02008-01-012008 Former US 66/US 180
I-40 Bus. 3.63 5.84 I-40/US 180/SR 99 west of Winslow I-40/US 180/SR 87 east of Winslow 01980-01-011980 current Former US 66/US 180. Decommissioned as a state highway in 2007.
I-40 Bus. Spur 1.20 1.93 SR 99 (3rd Street) in Winslow Winslow Industrial Spur west of Winslow 01980-01-011980 current Former US 66/US 180
I-40 Bus. 6.83 10.99 I-40/US 180 west of Joseph City I-40/US 180 east of Joseph City — — Former US 66/US 180
I-40 Bus. 15.47 24.90 I-40/US 180 west of Holbrook I-40/SR 77 east of Holbrook 01984-01-011984 current Former US 66
  •       Former

Notes

References

  1. ^ a b c d e Arizona Department of Transportation. "2008 ADOT Highway Log" (PDF). Arizona Department of Transportation. Retrieved 2008-04-30.
  2. ^ "Maximum posted speed limits by state". Insurance Institute for Highway Safety. Retrieved August 17, 2021.
  3. ^ Planning Survey Division (July 1, 1965). "1965-1966 Arizona Highway Sufficiency Rating; Route Log Showing Sufficiency Ratings For Each Section" (PDF). Arizona State Highway Department. Retrieved June 27, 2023 – via Arizona Memory Project.
  4. ^ Harelson, Hugh (December 4, 1960). "$3 Million Road Budget Explained". Arizona Republic. Phoenix. p. 17. Retrieved October 6, 2018 – via Newspapers.com.
  5. ^ Arizona Department of Transportation (February 28, 2015). "Arizona State Highway System Bridge Record" (PDF). Arizona Department of Transportation. Retrieved September 10, 2016.
  6. ^ Nothaft, Mark (February 21, 2017). "Which freeway came first in the Valley?". Arizona Republic. Retrieved June 18, 2019 – via AZCentral.com.
  7. ^ a b Cite error: Invalid <ref> tag; no text was provided for refs named ADOT Highway Log 02
  8. ^ a b "NETRonline: Historic Aerials - Viewer". NETR Online. Tempe, Arizona: Nationwide Environmental Title Research, LLC. 2018-09-10. Retrieved 2018-09-10.
  9. ^ a b Breyer, Joe. "Arizona DOT Right-of-Way Resolution 1962-151". Arizona Highway Data. Works Consulting, LLC. Retrieved March 6, 2016.
  10. ^ Arizona Department of Transportation (1971). ADOT Road Map of Arizona (Map). No Scale Given. Phoenix: Arizona Highway Department. Phoenix inset. Retrieved August 24, 2018 – via AARoads.
  11. ^ Breyer, Joe. "Arizona DOT Right-of-Way Resolution 1962-151". Arizona Highway Data. Works Consulting, LLC. Retrieved March 6, 2016.
  12. ^ a b ADOT, Multimodal Planning Division (2015). "State Highway System (ArcGIS)". Arizona Department of Transportation. Retrieved August 1, 2018.
  13. ^ "ATIS Nomenclature" (PDF). GPS Tools for Arc View. ADOT. August 2, 2000. pp. 57 to 64.
  14. ^ Cite error: Invalid <ref> tag; no text was provided for refs named ADOT 2007 Highway Log
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