I-90 - Eastgate to SR 900 - Corridor Improvements

Project news

Needs and benefits

As population grows in the Puget Sound region, so does traffic congestion. Traffic congestion in the I-90 corridor grew 74 percent between 2007 and 2016. In an effort to ease this congestion, WSDOT is creating added capacity on I-90 between the Eastgate and Lakemont interchanges through the addition of auxiliary lanes. These lanes will be located on the outside of the roadway in both directions of I-90, adding capacity 24 hours a day, seven days a week.

In addition, the project will construct new noise barriers in strategic locations along the improved route to minimize impact on residents along the project route.

What is an auxiliary lane?

An auxiliary lane is a supplemental or extra lane between interchanges. They are frequently used between closely spaced interchanges to allow for maneuvering of entering and exiting traffic, speed changes, weaving and truck climbing. 


  • Design: 2016 to early 2019
  • Construction: 2019 - 2021


Financial Data for PIN 109052P
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $0
CWA $73,200
Total $73,200


Colleen Gants

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