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SR 20 - North Cascades Highway

Newhalem Web camera
Web camera

Winthrop Web camera
Web camera

Avalanche Zones Map
Avalanche map

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: Closed for the season
UPDATE: March 26, 2015


The North Cascades Highway remains closed for the season to licensed motor vehicles between milepost 134, the Diablo Gate, in the west and milepost 171, the Silver Star Gate, 13 miles west of Mazama, in the east.

We are hopeful the highway can reopen Friday, April 3rd, in time for Easter weekend.
No promises, but if all goes well...!

The west end of the closed section of SR 20, from the Diablo Gate to milepost 143, is also closed to hiking, cycling and winter recreation activities. Crews are installing rock bolts to secure the slope in the Granite Creek area.

Why we close the highway in winter:
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
509-667-2815
Jeff.adamson@wsdot.wa.gov

Tom Pearce, Communications
Northwest Region-Shoreline
206-440-4696
Tom.Pearce@wsdot.wa.gov

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