Thompson River near Thompson Falls, MT
River level and flood forecast · Sanders County
Normal2.7 ftas of Mon 1:45 PM
The river is 4.3 ft below flood stage (7 ft).
Forecast to hold near 2.7 ft through Mon, Oct 19, 12 PM.
Flow: 137 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 9:36 AM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Flood stage | 7 ft |
| Action stage | 6.5 ft |
| Record crest (June 9, 1964) | 8.53 ft |
What floods at each level
From the National Weather Service, highest first.
- 9 ftFlooding affects low lying areas adjacent to the river. Homes in the community of Snider experience flooding and several roads in the community become inundated.
- 7 ftFlooding affects low lying areas adjacent to the river. Flooding also affects homes in the community of Snider.
Highest crests on record
- 8.53 ft — June 9, 1964
- 8.35 ft — May 17, 1997
- 7.84 ft — May 19, 2008
- 7.77 ft — May 21, 1956
- 7.72 ft — February 9, 1996
Recent crests: 5.14 ft (December 11, 2025) · 3.99 ft (May 5, 2025) · 5.15 ft (May 7, 2022) · 5.33 ft (May 25, 2021) · 5.1 ft (May 22, 2020)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (THRM8); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.