Marias River near Shelby, MT
River level and flood forecast · Toole County
Normal2.9 ftas of Mon 1:30 PM
The river is 6.1 ft below flood stage (9 ft).
Flow: 322 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 | 15 ft |
| Moderate flood stage | 13 ft |
| Flood stage | 9 ft |
| Action stage | 8 ft |
| Record crest (June 9, 1964) | 23.64 ft |
What floods at each level
From the National Weather Service, highest first.
- 14.5 ftWater encroaches onto Interstate 15. Traffic is blocked. Some ranchers and other residents need to prepare for evacuation.
- 11.5 ftA fairway on golf course floods. Williamson Park almost completely innundated.
- 9 ftWater floods east and northeast portions of Williamson Park. Low spots on golf course flood.
Highest crests on record
- 23.64 ft — June 9, 1964
- 18.21 ft — June 20, 1975
- 17.75 ft — June 18, 1948
- 16.05 ft — March 12, 1996
- 13.96 ft — January 27, 2011
Recent crests: 8.37 ft (June 21, 2022) · 9.96 ft (June 21, 2018) · 8.32 ft (May 12, 2018) · 6.21 ft (March 17, 2015) · 10.61 ft (June 19, 2014)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (SHLM8); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.