SR 20, North Cascades Highway closed for snowstorm - Nov. 2011
We close the North Cascades Highway when avalanche danger threatens 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. Avalanches typically close the highway between late November and mid December. Reopening in the spring usually falls between late March and early May.

North Cascades Highway email updates:

North Cascades Highway website:
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