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I-90 - Snoqualmie Pass East - Hyak to Keechelus Dam (Phase 1)

construction phase of project

This phase is five miles from Hyak to the Keechelus Dam vicinity.

Construction of the eastbound avalanche bridge.
We finished the first avalanche bridge Aug. 8, 2016. We start work on the second bridge summer 2016. Take a look at all the progress we are making.

I-90 des vis thumb nail
 Design Visualization of the I-90 Snoqualmie Pass East project.
 Screenshot from Lifeline video
I-90 is a major transportation corridor in Washington state, find out why


April 2017

  • Construction resumes April 17.
  • One of two new avalanche bridges is complete as well as the westbound wildlife overcrossing.

Why is WSDOT  improving safety and reliability on I-90?

Phase 1 is part of a 15-mile corridor improvement project to improve safety and reliability and reduce congestion along I-90 from Hyak to the Easton vicinity.

On an average day, 28,000 vehicles travel over Snoqualmie Pass and it doubles on weekends and holidays. Traffic volumes are expected to increase 1 percent every year, reaching an average of over 41,000 vehicles per day by 2030. 

Currently, WSDOT is improving the first five miles of the project from Hyak to Keechelus Dam.

The End Result

WSDOT will increase capacity and improve safety by:

  • Adding a new lane in each direction
  • Replacing deteriorating concrete pavement
  • Reducing road closures due to avalanches
  • Adding and replacing bridges and culverts
  • Straightening sharp curves
  • Stabilizing rock slopes

Project Benefits

  • Safety. Corrective measures will reduce the risk of avalanche and associated road closures within the project area as well as reduce the risk of rock and debris slides from unstable slopes onto the roadway.
  • Congestion Relief. WSDOT will increase capacity by 50 percent in each direction to accommodate projected traffic volumes for the next 20 years. Crews will extend chain-up-and-off areas assisting freight vehicles.
  • Environment. WSDOT will reduce the risk of collisions between wildlife and vehicles by building wildlife crossings.

What is the project timeline?

  • Spring 2009 - construction begins
  • Fall 2018 - construction complete

Financial Information

The 2005 gas tax invested $551 million in the I-90 corridor.

This project recently had construction change orders of more than $500,000.  View all change orders.


How can I get more information?
Jeff Minnick, WSDOT project engineer
Phone: 509-577-1840

Meagan Lott, WSDOT communications
Phone: 509-577-1618

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