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Stretch of Highway 21 closed due to avalanche danger

The section of road known as Avalanche Alley is shut down multiple times each winter.
Credit: Paul Boelke
File image of road closure sign along Highway 21 north of Idaho City.

BOISE, Idaho — A section of Idaho Highway 21 closed Thursday at 5 p.m. due to "high avalanche risk," the Idaho Transportation Department announced.

In a tweet posted Thursday afternoon, the department said the planned closure affected the area between Grandjean Junction and Banner Summit.

The stretch of highway, known as Avalanche Alley, is shut down multiple times each winter due to the threat of avalanches.

There is no word from ITD on how long this closure might last.

The closed section of road sits between Lowman and Stanley. Drivers hoping to take that route are urged to check ITD's 511 page for road condition updates.

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