Debris Flow in Custer County, Idaho
Debris Flow August 26, 2025 · Custer County, Idaho
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
The Idaho Transportation Department closed a 12-mile stretch of state Highway 21, from Banner Summit to Grandjean Road, due to a landslide on on August 26th.
ITD stated on Facebook around 5:30 p.m. Tuesday that the section of highway will be 'potentially' closed for the next two days.
The closure came shortly before the National Weather Service issued a flash flood warning for the Highway 21 corridor south of Banner Summit.
Began near Stanley (44.0153, -115.2151).
Source: NOAA Storm Events Database, event 1290868. Narratives are written by the National Weather Service forecast office that issued the report.
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