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Boise's Leading Local News: Weather, Traffic, Sports and more | Boise, Idaho | KTVB.com

Idaho 21 reopens after closure for avalanche risk

Idaho Highway 21 shut down at 4 p.m. on Sunday due to a high avalanche risk.
Credit: Paul Boehlke/KTVB
This section of Idaho 21 is known as "avalanche alley." It takes a lot of work for ITD crews to keep it open during the winter.

LOWMAN, Idaho — Idaho Highway 21 from Grandjean to Banner Summit is back open after the Idaho Transportation Department monitored avalanche risk in the area.

The highway was reopened Tuesday morning. 

The section had been closed since Sunday afternoon due to high avalanche risk and a a weather system that brought snow and rain to the area.

The alternate route between the Treasure Valley and Stanley was to head east on I-84, use Exit 95 to U.S. 20 in Mountain Home, then travel north on Idaho Highway 75.

ITD Avalanche Crew monitors the snowpack on this section of the highway to predict the risk of avalanches large enough to hit the road, which will allow ITD to keep the highway open during the winter months.

There are 60 avalanche paths within the 11 mile stretch of ID-21. The Avalanche Crew will monitor the snowpack when a snowstorm hits the area and after and will reopen the highway once the snowpack has stabilized.

Updates on closures and openings can be found on 511 and ITD's Twitter account.

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