Welcome to the website for the Seward Highway: O'Malley Road to Dimond Boulevard project. The Alaska Department of Transportation and Public Facilities (DOT&PF) will use this site to keep you informed about project development. Please refer to this site for updates on the project, documents, announcements of public meetings, and to make a comment or suggestion.


Project Description


This is the third in a series of projects to improve capacity, safety, access, and connectivity on the Seward Highway between Rabbit Creek Road and 36th Avenue.


Current (35%) design includes the following proposed elements:


These proposed improvements will:


This project will include public and stakeholder involvement and coordination with adjacent projects such as the Seward Highway: Dimond Boulevard to Dowling Road Project (DOT&PF, in construction) and the Academy/Vanguard Drive Traffic Circulation  Improvements (Municipality of Anchorage [MOA] project).


What's a Diverging Diamond Interchange?


Diverging Diamond Interchanges (DDI) are an innovative, proven solution for improving safety and mobility at interchanges. DDIs have been shown to:


Aerial - Project Overview: (Click to enlarge)

















Cross Section: (Click to enlarge)










Interchanges - 35% Design: (Click on image to enlarge)


Dimond-Abbott                                      O'Malley Road                                      Scooter-Academy

Diverging Diamond Interchange            Diverging Diamond Interchange           Roundabout Interchange









Video Links Illustrating DDIs


Other Links


Search Box Example 1

Purpose and Need


The purpose of the proposed action is to construct improvements to the Seward Highway corridor between Rabbit Creek Road and 36th Avenue to address current and future travel demands and mobility needs. The improvements provide additional capacity, connectivity, and safety enhancements. Existing peak-hour congestion in the study area is expected to worsen, as indicated by the regional growth and economic development projections described in Anchorage 2020: Anchorage Bowl Comprehensive Plan (MOA, 2001) and the Anchorage Bowl 2025: Long Range Transportation Plan (MOA, DOT&PF, and Anchorage Metropolitan Area Transportation Solutions [AMATS], 2007). Upgrades and additional connections to the Seward Highway will provide needed capacity to meet the travel demands generated by growth in the region.




It is anticipated that more than 90% of the funding for the Seward Highway: O’Malley Road to Dimond Boulevard Project will be federally funded and developed in accordance with Federal Highway Administration (FHWA) guidelines. At this time, construction is projected to cost approximately $80-100 million.




Project History


Between 2001 and 2007 the DOT&PF conducted an Environmental Assessment on the environmental impacts of making improvements to the Seward Highway in Anchorage. The analysis resulted in an Environmental Assessment – Finding of No Significant Impact  that was signed by the Federal Highway Administration in February 2007. Preliminary engineering determined the highway should be improved in sections. Design and construction of the segment from Tudor Road to Dowling Road was completed in 2013. Design of the Dowling Road to Dimond Boulevard segment is complete and construction is anticipated to start in 2017.  The segment from O’Malley Road to Dimond Boulevard is the next to enter the detailed design phase.


Translate this page:

Project Information

IRIS Project No. CFHWY00012

Federal Project No. 0537(008)








Regional Links



Join the Mailing List

Sign Up Now

State Employees

Central Region Projects

DOT&PF Project Info


Title VI Nondiscrimination

Terms of Use

Copyright Info

DOT&PF Employee Directory

Links for DOT&PF Staff

Department of Transportation & Public Facilities

PO Box 112500

3132 Channel Drive

Juneau, Alaska 99811-2500

Phone:  907-465-3900 || 907-586-8365 (FAX)