SH-21 to close tonight north and south of Lowman for avalanche risk, drifting

Barricades up to close SH-21 at milepost 48 in November of 2022

The Idaho Transportation Department will close State Highway 21 north and south of Lowman tonight at 6 p.m. as a major storm system brings heavy snow, high winds and avalanche danger to the region.

The highway frequently closes between Lowman and Stanley from Grandjean to Banner Summit, but another section will also close south of Lowman from milepost 70 to milepost 48 near Idaho City.

“This storm could deliver up to two feet of fresh snow, and with wind gusts near 25 miles per hour, we are expecting next to no visibility and drifting, making it too dangerous to travel,” Field Operations Manager Eric Copeland said. “For those reasons, we are closing both sections of SH-21 this time.”

Based on forecasted weather, the highway could reopen sometime on Saturday, March 11. Drivers should check and ITD’s Twitter account for updates before traveling.