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Alaska Interstates

Routing

According to the Federal Highway Administration Interstate Highway Route Log and Finder List, Alaska has four Interstate highways that creates a 1,082.22-mile system in the northernmost state. Even though these routes are designated as Interstate highways, they are generally not constructed to Interstate standards and are signed as Alaska State Routes.

Route Southern/Western Terminus Northern/Eastern Terminus
A-1 Interstate A-3 - Anchorage Canadian Border - Yukon Territory
A-2 Interstate A-1 - Tok Junction Interstate A-4 - Fairbanks
A-3 Soldotna Interstate A-1 - Anchorage
A-4 Interstate A-1 - Palmer Interstate A-2 - Fairbanks

History

On December 31, 1981 the Federal Highway Administration approved the addition of the four Alaska Interstates between the following locations:

  • A-1 from the Alaska-Canada border near Northway west to junction A-2 at Tok Junction, south to junction A-4 near Glennallen and continuing west to junction A-3 at Anchorage.
  • A-2 from a junction with A-1 at Tok Junction west to junction A-4 and FAP-65 in Fairbanks.
  • A-3 from a junction with A-1 in Anchorage south and west to junction FAP-21 and FAP-22 in Soldotna via a junction with FAP-31 in the vicinity of Moose Pass.
  • A-4 from a junction with A-1 near Palmer northwest via Wasilla, Denali National Park and Preserve and Nenana to a junction with A-2 and FAP-65 in Fairbanks.

AASHTO then approved the numbering of the Alaska Interstates on June 28, 1982.1

For more details and pictures, see Oscar Voss's Alaska Interstate Ends. Thanks go to Oscar and Stephen Summers for assisting AARoads with information and constructing this page.

Sources:

  1. AASHTO - Route Numbering Committee Agenda, dated June 28, 1982, Portsmouth, NH.

Page Updated May 7, 2014.

 
Mileage

Route A-1
Mileage 408.23
Cities Anchorage, Palmer, Tok Junction
Junctions Interstate A-4 in Palmer; Interstate A-2 in Tok Junction
State Routes Alaska 1, Anchorage east to Tok Junction; Alaska 2, Tok Junction east to International Border
Route A-2
Mileage 202.18
Cities Anchorage, Palmer, Tok Junction
Junctions Interstate A-4 in Palmer; Interstate A-2 in Tok Junction
State Routes Alaska 2 from Tok Junction north to Fairbanks
Route A-3
Mileage 148.12
Cities Soldotna, Anchorage
Junctions Interstate A-1 in Anchorage
State Routes Alaska 1 from Soldotna north to Anchorage
Route A-4
Mileage 323.69
Cities Wasilla, Denali National Park, Fairbanks
Junctions Interstate A-1 near Palmer; Interstate A-2 in Fairbanks
State Routes Alaska 3 from its junction with Alaska 1 near Palmer north to Anchorage
TOTAL 1,082.22
Source: October 31, 2002 Interstate Route Log and Finders List
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