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

Project news

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, 31,000 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 39,000 vehicles per day by 2040.

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

Needs & 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.


  • Spring 2009 - construction begins
  • Fall 2019 - construction complete


Financial Data for PIN 509090B, 509090C, 509090D, 509090E, 509090F, 509090G, 509090H, 509090I
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $379,398
Pre-Existing Funds (PEF) $0
CWA $0
Total $379,398

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.


Jerry Wood
Project Engineer
Phone: 509-577-1859

Meagan Lott
Phone: 509-577-1618

Thumbnail - I-90 - Phase 1 and 2 map

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.