Musselshell River near Mosby, MT
River level and flood forecast · Petroleum County
Normal2.6 ftas of Mon 1:45 PM
The river is 7.4 ft below flood stage (10 ft).
Flow: 67 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 5 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 14 ft |
| Moderate flood stage | 12 ft |
| Flood stage | 10 ft |
| Action stage | 8 ft |
| Record crest (July 27, 1993) | 17.7 ft |
What floods at each level
From the National Weather Service, highest first.
- 12 ftBuildings near Musselshell River begin to flood.
- 10.5 ftLow land flooding begins.
Highest crests on record
- 17.7 ft — July 27, 1993
- 16 ft — May 23, 2011
- 15.6 ft — June 10, 2011
- 15.17 ft — February 19, 1965
- 15.1 ft — March 12, 1979
Recent crests: 10.28 ft (February 25, 2025) · 11.71 ft (June 3, 2023) · 9.93 ft (March 20, 2019) · 11.11 ft (June 1, 2018) · 11.52 ft (March 22, 2018)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (MSBM8); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.