Rivers in Montana
Prospect Creek at Thompson Falls
Below flood stage
0.50ftStage
Observed Sat, Sep 26, 2:15 AM MDT
- Flood stage
- 7.50 ft
- Forecast crest
- 0.53 ftSun, Sep 27, 6:00 AM MDT
- Record crest
- 9.86 ft1974
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 9.00 ft |
| Moderate flood | 8.00 ft |
| Minor flood | 7.50 ft |
| Action | 6.50 ft |
- 8.50 ftA petroleum gas pipeline becomes exposed underneath the creek due to high flood flows.
- 8.19 ftHomes along Prospect Creek become surrounded with water from Prospect Creek.
- 8.10 ftWater begins flowing across Prospect Creek Road.
- 7.50 ftRoad washouts are possible along Prospect Creek Road.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | Under 5% |
| Moderate flooding | Under 5% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 25, 2026.
Crest history
16 crests on NOAA’s list since 1956.
| # | Date | Stage |
|---|---|---|
| 1 | January 16, 1974 | 9.86 ft |
| 2 | February 9, 1996 | 9.54 ft |
| 3 | March 19, 2017 | 8.10 ft |
| 4 | May 13, 1971 | 7.60 ft |
| 5 | May 21, 1956 | 7.60 ft |
| 6 | May 19, 2008 | 7.27 ft |
| 7 | May 11, 1976 | 7.09 ft |
| 8 | June 1, 1972 | 7.09 ft |
| 9 | May 17, 1997 | 6.94 ft |
| 10 | April 25, 2012 | 6.52 ft |
| 11 | December 11, 2025 | 6.35 ft |
| 12 | April 14, 2002 | 6.23 ft |
| 13 | May 7, 2022 | 5.01 ft |
| 14 | May 31, 2020 | 4.54 ft |
| 15 | May 2, 2021 | 3.99 ft |
| 16 | March 28, 2025 | 3.55 ft |
Most recent crests
- December 11, 2025: 6.35 ft
- March 28, 2025: 3.55 ft
- May 7, 2022: 5.01 ft
- May 2, 2021: 3.99 ft
- May 31, 2020: 4.54 ft
- March 19, 2017: 8.10 ft
- April 25, 2012: 6.52 ft
- May 19, 2008: 7.27 ft
- April 14, 2002: 6.23 ft
- May 17, 1997: 6.94 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the Northwest River Forecast Center. Forecasts are issued routinely year-round.
Sources
Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.