Debris Flow — Ravalli, Montana

2025-07-30 · near Sula, Ravalli, Montana

Event narrative

Radar-estimated rainfall of 1.77 inches fell in one and a half hours and triggered a debris flow that covered the East Fork Road, east of Sula, at Mile-marker 4.

Wider weather episode

Slow-moving thunderstorms brought torrential rainfall and triggered subsequent debris flows across parts of southwest Montana. The event was exacerbated by a deep layer of atmospheric moisture, with precipitable water values measured at nearly one inch, leading to highly efficient and impactful rainfall.

View location on OpenStreetMap → (45.8563, -113.9325)

Source: NOAA Storm Events Database, event_id 1286097. Narrative written by the NWS forecast office that issued the report.