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Flash Flood — Cascade, MT

Jul 31, 2025

Flood Cause
Heavy Rain

An upper-level shortwave combined with monsoon moisture brought a few severe thunderstorms and localized areas of heavy rainfall to North-Central MT. This resulted in isolated large hail, flooding, and a landspout. A stationary storm developed directly over the Great Falls urban area; this produced heavy rainfall and flash flooding in the city, with one gauge reporting 2.25 inches of rain in an hour. Another thunderstorm produced heavy rainfall over the Horse Gulch burn scar, which caused flash

Source: NOAA National Weather Service Storm Events Database (event 1285049). Narrative written by NWS staff at the time of the event.

Flood Risk Context for Cascade, MT

This event is one of many recorded floods in Cascade County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.

View Cascade County flood data →

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