Debris Flow — Lemhi, Idaho

2021-08-01 · near Ellis, Lemhi, Idaho

Event narrative

The Idaho Department of Transportation reported numerous rock and mudslides blocking US Highway 93 between Elk Bend and Ellis as a result of heavy rainfall. The roadway was closed for a period of time to allow for crews to clear roadways. Area gauge measurements suggested half an inch of rain fell across the US Highway 93 corridor over a 3 hour period.

Wider weather episode

Monsoonal subtropical moisture set the stage for thunderstorms to produce heavy rainfall across portions of the central Idaho.

View location on OpenStreetMap → (44.6972, -113.9933)

Source: NOAA Storm Events Database, event_id 976610. Narrative written by the NWS forecast office that issued the report.