List of Interstate Highways in Alaska

The Interstate Highways in Alaska are all owned and maintained by the US state of Alaska.[2] The Alaska Department of Transportation & Public Facilities (DOT&PF) is responsible for the maintenance and operations of the Interstate Highways. The Interstate Highway System in Alaska comprises four highways that cover 1,082.22 miles (1,741.66 km). The longest of these is Interstate A-1 (A-1), at 408.23 miles (656.98 km) long, while the shortest route is A-3, at 148.12 miles (238.38 km) long. All Interstates in Alaska are unsigned[3] and are not generally referred to by their highway numbers.

Dwight D. Eisenhower National System of Interstate and Defense Highways

Interstate A-1 marker

Interstate A-2 marker

Interstate A-3 marker

Interstate A-4 marker

Shields for Interstates in Alaska
Interstates of Alaska highlighted in red
System information
Length1,082.22 mi[1] (1,741.66 km)
Formed1976
Highway names
InterstatesInterstate A-n (A-n) (unsigned)
StateAlaska Route n (AK-n)
System links

Interstates in Alaska follow the numbering system Interstate A-n, where n represents the number of the Interstate. This follows the similar numbering systems for Hawaii and Puerto Rico.[1] The Interstate Highway System was expanded to Alaska in 1976, by the Federal-Aid Highway Act of 1976, which defined the system for Interstates in Alaska and Puerto Rico under 23 U.S.C. § 103(c)(1)(B)(ii).[4]

Most of the lengths of the Interstates in Alaska are not constructed to Interstate Highway standards but are small, rural, two-lane undivided highways. Title 23 provides that "Highways on the Interstate System in Alaska and Puerto Rico shall be designed in accordance with such geometric and construction standards as are adequate for current and probable future traffic demands and the needs of the locality of the highway."[4] Some portions of these highways are built to Interstate standards, though. The Seward Highway, part of A-3, is built to freeway standards in Anchorage.[5] The Glenn Highway, which is part of A-1, is built to freeway standards from Anchorage to Wasilla.[6] A very small portion of the George Parks Highway, A-4, is constructed to freeway standards in Wasilla.[7] In and around Fairbanks, the Richardson Highway, part of A-2, is constructed to freeway standards.[8] In addition to these highways, the Johansen Expressway, in Fairbanks, and the Minnesota Drive Expressway, in Anchorage, are constructed to expressway standards.

Routes
Number Length (mi)[1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
A-1 408.23[6]656.98 AnchorageCanadian border in Alcan Border 01976-01-011976current Glenn Highway, Richardson Highway, Tok Cut-Off, Alaska Highway[9][10][11][12]
A-2 202.18[8]325.38 TokFairbanks 01976-01-011976current Alaska Highway, Richardson Highway[10][11][12]
A-3 148.12[5]238.38 SoldotnaAnchorage 01976-01-011976current Seward Highway, Sterling Highway[9][11][12]
A-4 323.69[7]520.93 Gateway, near PalmerFairbanks 01976-01-011976current Parks Highway[9][10][11][12]

See also

References
  1. Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved January 24, 2023.
  2. Staff. "Interstate Frequently Asked Questions". Federal Highway Administration. Retrieved May 31, 2012.
  3. Weingroff, Richard F. (April 7, 2011). "Interstates in Hawaii: Are We Crazy???". Ask the Rambler. Federal Highway Administration. Retrieved March 15, 2011.
  4. United States Congress. "Title 23, Chapter 1, Section §103". U.S. Government Printing Office. Retrieved May 31, 2012.
  5. Google (May 31, 2012). "Overview Map of Interstate A-3" (Map). Google Maps. Google. Retrieved May 31, 2012.
  6. Google (May 31, 2012). "Overview Map of Interstate A-1" (Map). Google Maps. Google. Retrieved May 31, 2012.
  7. Google (May 31, 2012). "Overview Map of Interstate A-4" (Map). Google Maps. Google. Retrieved May 31, 2012.
  8. Google (May 31, 2012). "Overview Map of Interstate A-2" (Map). Google Maps. Google. Retrieved May 31, 2012.
  9. Witt, Jennifer W. (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on March 30, 2014. Retrieved March 15, 2012.
  10. Birkholz, Ethan (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
  11. Federal Highway Administration. "Dwight D. Eisenhower Interstate Routes Statewide" (PDF). U.S. Department of Transportation. Retrieved May 31, 2012.
  12. Federal Highway Administration. "Alaska Department of Transportation and Public Facilities Routes by Description: CDS Route Numbers as of 28 October 2008" (PDF). U.S. Department of Transportation. Retrieved May 31, 2012.
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