Snoqualmie Pass

Snoqualmie Pass is a mountain crossing through the Cascade Range at about 920 meters elevation that links eastern and western Washington State. Interstate 90 runs through this passage, making it the primary route for traffic between both sides of the state.

The Great Northern Railway opened the railroad route through this pass in 1909 to connect the two sides of Washington. To improve traffic flow, the Snoqualmie Tunnel was completed in 1914, making train service more reliable throughout the year.

Native American tribes utilized this natural passage through the Cascade Mountains for generations before European settlers discovered its potential for transportation.

The pass receives heavy snowfall annually, so drivers should carry tire chains and check road conditions during winter months. Regular updates on traffic conditions are important, especially during winter season and on weekends.

While this pass is mainly known as a highway route, about 29,000 vehicles use it daily, making it one of the most traveled mountain routes in the region. This heavy traffic volume shows how vital this corridor is for connecting the two sides of the state.

Location: Washington

Elevation above the sea: 921 m

GPS coordinates: 47.41000,-121.40600

Latest update: December 6, 2025 21:20