This is Idaho 21, known as "Avalanche Alley." It reopened yesterday after a nearly weeklong closure due to- well- avalanches.
The 12-mile stretch between Grandjean Junction and Banner Summit got 25 inches of additional snow during the closure, while crews tried to clean up the already-deep snow, which was strewn with rocks and timber.
Avalanche Alley has about 60 avalanche chutes. You can see more pictures here.