State Route 20 is the northernmost route across the Cascade Mountain Range in Washington and is commonly referred to as the North Cascades Highway. This Scenic Byway offers travelers a wide array of beautiful vistas and is part of the Cascade Loop, a 400-mile driving tour through the Cascades. Take a virtual drive on the highway from your computer.
Pass status: Open
UPDATE: Thursday, Aug. 28 1:46 p.m. - SR 20 is open between Twisp and Okanogan. However, drivers should expect delays near milepost 208. Traffic is reduced to one lane, with a pilot car guiding vehicles through the area. SR 153 remains closed between Benson Creek (milepost 27.63) and milepost 22 due to mudslides. A detour is available via the Twisp-Carlton Road.
Spring - The gates opened at noon on Thursday, May 8.
Read the News Release
View the Flickr photos
Why we close the road
We close the North Cascades when weather, snow conditions and avalanche danger threaten the safety of drivers and our maintenance crews. We close the highway on the west side at milepost 134, east of Diablo, and on the east side at milepost 171, 14 miles west of Mazama. As the snow gets too deep for the plow truck, the east closure point is moved 7 miles down to the Early Winters Information Center at milepost 178. Avalanches typically close the highway between late November and mid December.
Reopening in the spring is usually accomplished by early May.
Current driving conditions
Between April and November when the road is typically open, we post the current North Cascades Pass report on our WSDOT mountain passes Web page as we do for all of the passes. May through October, pass conditions are only posted if there's a potential travel hazard.
Current weather conditions
For recreation purposes and while the highway is closed, or in the summer when the pass reports are suspended, you can find weather information with these links:
Contacts for more information
Jeff Adamson, Communications
North Central Region-Wenatchee
Tom Pearce, Communications
Sign up for: E-mail updates for North Cascades Highway