Yaak River near Troy, MT
River level and flood forecast · Lincoln County
Normal2.9 ftas of Mon 12:45 PM
The river is 5.1 ft below flood stage (8 ft).
Forecast to hold near 2.9 ft through Mon, Oct 19, 12 PM.
Flow: 84 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
| Major flood stage | 10 ft |
| Moderate flood stage | 9 ft |
| Flood stage | 8 ft |
| Action stage | 7.5 ft |
| Record crest (May 27, 1948) | 11.1 ft |
What floods at each level
From the National Weather Service, highest first.
- 8.5 ftFlooding affects low lying areas adjacent to the river including homes and access roads. Sylvanite Ranger Station Road and Upper Ford Road affected by flooding.
- 8 ftFlooding affects low lying areas adjacent to the river.
Highest crests on record
- 11.1 ft — May 27, 1948
- 9.7 ft — May 21, 1956
- 9.58 ft — May 17, 1997
- 9.07 ft — May 22, 1967
- 8.96 ft — May 11, 1976
Recent crests: 7.94 ft (December 17, 2025) · 8.3 ft (December 11, 2025) · 6.23 ft (May 4, 2025) · 6.37 ft (May 26, 2021) · 7.79 ft (May 21, 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 (TRYM8); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.