North Cascades Highway closed for the season

Map of SR 20 (North Cascades Highway) closure in northern Washington. Credit: WSDOT.

North Cascades Highway (SR-20) is closed for the season due to heavy snowfall and high risk of avalanche. 

The road closure point starts at milepost 134 at Ross Dam Trailhead, east of Diablo Lake, and will run to milepost 171 at Silver Star Gate.

The Washington State Department of Transportation (WSDOT) closed the highway on Friday, Nov. 13th. 

SR-20 closes every year once snow fills avalanche chutes that line the highway. Officials say once these chutes are filled, it poses a safety risk to travelers and road crews. 

The North Cascades Highway runs across the Cascade Mountain Range and serves as an access point to North Cascades National Park, Ross Lake National Recreational Area and Lake Chelan National Recreation Area.

Once snow levels drop, WSDOT crews will move the western closure point back to milepost 130 at Colonial Creek Campground to milepost 178 at Early Winters Campground.