Glenn Highway and Muldoon Road Interchange Improvements

Glenn/Muldoon Interchange Project Header

Construction News

Neeser Construction Inc. has been selected to construct the Glenn Muldoon DDI. Work will begin in the Spring of 2016, continue over three seasons, and be completed in the summer of 2018.

Traffic will use the existing overpass on Muldoon Road while the new bridges are being built. Temporary traffic signals will be constructed at the interchange ramps to maintain traffic flow during construction. The temporary ramps will operate as good or better than the existing ramps to minimize disruption to the public.

Public outreach will continue throughout construction of the DDI to familiarize the public with motorized and non-motorized use of the new interchange.

Public meeting #4 will be held in Spring 2016.


Watch this instructional video on how to drive, walk, or bike through the Diverging Diamond Interchange at the Glenn Highway and Muldoon Road:

Click on the graphics above to view larger

View construction phasing graphics here.


The Diverging Diamond Interchange design requires complete reconstruction of the interchange, including two new three-lane bridges, and offers the following benefits to users:


  • Improves interchange operations by reducing delay and increasing capacity.
  • Minimizes disruption to traffic and business along Muldoon Road during construction because the bridges can be built while maintaining traffic on the existing structure.


  • Reduces speeds through the interchange.
  • Improves safety by removing opposing traffic for all left-turning and right-turning movements to and from the ramps.

Non-Motorized Users

  • Reduces conflicts between vehicles and pedestrians by signalizing all pedestrian crossings.
  • Provides a direct easy-to-use route through the interchange for bicyclists and pedestrians.


The Alaska Department of Transportation and Public Facilities (DOT&PF) has determined that the Glenn Highway/Muldoon Road interchange needs to be upgraded to accommodate current and future needs. The purpose of this project is to improve operations, capacity, and safety for all users of the interchange, including motorized and non-motorized traffic, and freight transportation. The goal is to develop and implement a long term solution to address vehicle and pedestrian traffic concerns within the interchange area.

Three public meetings were held to introduce the project, provide information about the project development process, and to solicit comments. An additonal public meeting will be held in Spring 2016.

Public involvement activities will continue throughout the project.


The Muldoon Road/Glenn Highway interchange is the gateway to Anchorage. It is the northernmost junction between the Glenn Highway and Anchorage’s arterial street network and it is the primary access to the Tudor/Muldoon road corridor. Constructed in the mid-1970s, the interchange is a rural, partial cloverleaf design.

Project Area Map

Overall, land development in the north Muldoon area has caused significant traffic volume increases. Sidewalks and non-motorized trails are limited to the east side of the interchange and they often force pedestrians and bikers to travel out-of-direction to get across the interchange. As a result, some pedestrians cross at undesignated locations creating unsafe conditions. Additionally, bridge clearance for trucks and large vehicles is below current minimum height standards.


This project is state funded, however to maintain eligibility for use of federal funds, all scoping activities were conducted in accordance with the requirements of the National Environmental Policy Act (NEPA).