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I-405 Corridor Program

Bellevue Braids ribbon cutting
Former WSDOT Secretary Paula Hammond celebrates with Bellevue Deputy Mayor Robertson, Atkinson Construction, Rep. Ross Hunter and I-405 Project Director Kim Henry as John Nies cuts the the ribbon on the Bellevue Braids project.

How will we address long-term solutions for I-405? 
I-405 routinely ranks as one of the state's most congested corridors. Starting more than a decade ago, WSDOT worked with cities, counties, federal agencies, transit agencies and community groups to develop consensus on a long-term vision for the multimodal redevelopment of this highway.

This effort culminated in a three-year environmental impact statement development process that outlines transit, roadway and environmental investments. The EIS, approved with the Record of Decision in October 2002, now serves as the corridor Master Plan. WSDOT continues to work with local communities and transit agencies to improve I-405. 

What has the I-405 Corridor Program accomplished to date?

 I-405 corridor project checklist
(Click image to enlarge)

Since the master plan for I-405 improvements (PDF) was adopted, we have focused on funding groups of projects that directly address the worst congestion chokepoints first, coordinating all transportation modes into a working system. With funding from the 2003 Nickel and 2005 Transportation Partnership Account, the state has invested nearly $1.5 billion into the corridor. 

Four Nickel-funded projects are complete (Kirkland Nickel Stage 1, South Bellevue Widening, Renton Stage 1 - Widening and the NE 116th Interchange and Street Improvement project). Three TPA-funded projects are complete (NE 10th Street Bridge-Stage 2, Renton Stage 2 - Widening, and NE 8th Street to SR 520 Improvement project), and one is under construction (NE 6th to I-5 Widening and Express Toll Lanes). Another project, the I-405/SR 167 Direct Connector  is in the preliminary design stage, using corridor project savings.

The End Result: An Improved Multimodal System
The I-405 Master Plan is a balanced, multimodal plan to guide future transportation investments. Highlights include:

  • Two new lanes in each direction
  • Local arterial improvements
  • 10 new transit centers
  • Bus rapid transit (BRT) system
  • 50 percent transit service increase
  • Direct access ramps for transit and carpools
  • 5,000 new Park and Ride spaces
  • 1,700 new vanpools
  • Bicycle and pedestrian improvements
  • Managed lanes system
  • Environmental enhancements, including stormwater and habitat improvements

What projects are currently unfunded?
Several critical funding gaps remain in the corridor, including priority projects at the I-405/SR 167 interchange and the portion of I-405 between Renton and Bellevue. These projects will be constructed as funding becomes available.

Current funded I-405 improvement projects underway include:

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Funding: Partnership
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