I-90 - Snoqualmie Pass East - Cabin Creek Interchange to West Easton Interchange (Phase 3)

Project news

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

Phase 3 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 traffic numbers double on weekends and holidays. Traffic volumes are expected to increase 2.1 percent every year, reaching an average of over 41,000 vehicles per day by 2030.

This phase includes approximately six miles of improvements between the Cabin Creek Interchange to the West Easton Interchange.  

The end result

WSDOT will increase traffic capacity and improve safety by:

  • Adding a new lane in each direction
  • Replacing concrete pavement
  • Stabilizing rock slopes
  • Building wildlife crossings
  • Improving sight distance and traffic safety 
  • Improving traffic management technology systems

Needs & benefits

  • Safety. WSDOT will increase traffic safety by replacing concrete pavement, improving driver sight distance, improve shoulders and investing in new traffic management technology.
  • Congestion Relief. WSDOT will increase freight and mobility reliability of this vital transportation corridor by adding a new lane in both directions.
  • Environmental. WSDOT partnered with state, federal and private groups to deliver a streamlined mitigation strategy to address water quality, aquatic life and wildlife goals in this unique Cascade Mountain area.


2020 - preliminary construction is scheduled to begin
Fall 2025 - scheduled completion


Financial Data for PIN 509093A, 509093B
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $0
CWA $339,542
Total $339,542


Andrew Byrd
Project Engineer

Summer Derrey

Thumbnail - I-90 - Phase 3 and 4 map