Prospect Creek At Thompson Falls flow report
As of July 16, 2026, Prospect Creek At Thompson Falls is flowing at 90 cfs with a gage height of 1.06 ft, holding steady over the past 24 hours. Source: USGS gauge #12390700, refreshed throughout the day.
Historical Data
Prospect Creek At Thompson Falls at a glance
How Prospect Creek At Thompson Falls is running right now, where it sits on the map, and the key gauge stats.
Prospect Creek At Thompson Falls is flowing at 90 cfs, with the water sitting 1.06 ft at the gage. Flow has held roughly steady over the past 24 hours.
This is USGS gauge #12390700 in Montana. Over the past 10 days the average has been 93 cfs, peaking at 100 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Montana flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #12390700).
Percentiles are flow-duration values computed from this gauge’s observed daily record as archived by Snoflo. Return periods are Weibull plotting-position estimates from observed annual maxima, provided as general reference context only. Always verify against official USGS NWIS records. Part of Snoflo for Engineering.
Streamflow Forecast
Over the next 5 days, Prospect Creek At Thompson Falls Mt is expected to hold near today's 90 cfs, toward roughly 81 cfs by 2026-07-20 (likely range 54-123 cfs) -- running well below the seasonal normal.
Powered by PULSE — Snoflo’s forecast engine, trained on this gauge’s full record of storms, snowmelt, and dry spells.
| Date | Expected (p50) | Likely range (p25–p75) | vs normal | Projected stage |
|---|
How does this compare to past years?
Year-over-year overlay, annual peak discharge, the full distribution of daily flows on record, and the gauge's rating curve.
Weather Forecast
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day forecast
Daily temperatures, snow, and rain projected over the next two weeks.
Prospect Creek At Thompson Falls
The main constituents of the flow are snowmelt and precipitation. The gauge is located near the Clark Fork River, which is a major tributary of the Columbia River. There are no major dams on the creek, but there are several smaller ones. The flow of the creek is highest in the spring due to snowmelt and decreases throughout the summer and fall. Interestingly, Prospect Creek is known for its vibrant blue-green color, which is caused by dissolved minerals in the water. Overall, the streamgauge provides valuable data for understanding the hydrology of the region.
Nearby streamflow levels
Cross-check Prospect Creek At Thompson Falls's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Prospect Creek At Thompson Falls Mt | 90 cfs |
| Thompson River Near Thompson Falls Mt | 255 cfs |
| St. Regis River Near St. Regis | 166 cfs |
| Clark Fork At St. Regis Mt | 5,990 cfs |
| Clark Fork Near Plains Mt | 18,900 cfs |
| Canyon Creek Ab Mouth At Wallace | 20 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Prospect Creek At Thompson Falls. Spring snowmelt is the dominant driver of streamflow in mountain basins -- a deep snowpack upstream means more runoff later in the season.
| SNOTEL station | Snowpack |
|---|---|
| Lookout | 0 in |
| Nohrsc Lookout | 0 in |
| Humboldt Gulch | 0 in |
| Nohrsc Humboldt Gulch | — |
| Sunset | 0 in |
| Nohrsc Sunset | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Prospect Creek At Thompson Falls.
Boat launches
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River runs
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River levels & flood safety
- Read the level before you go
- A river that's runnable at one flow can be deadly at another. Check current discharge and gage height — like the values shown above — against the flood-stage thresholds, and remember levels can spike fast after rain or a dam release.
- Respect cold water
- Snowmelt rivers run cold even in summer. Sudden immersion triggers cold-water shock and saps strength within minutes. Wear a PFD, dress for the water temperature (not the air), and never wade or paddle alone.
- Watch for swiftwater hazards
- Strainers (downed trees), undercut rocks, and low-head dams are the deadliest features on moving water. High, fast, muddy water hides them. If in doubt, scout from shore and portage.
- Mind flash floods & releases
- Narrow canyons can flood from a storm miles upstream, and dam-controlled reaches can rise without warning. Know the forecast, the release schedule, and your exit before you launch.
Track Prospect Creek At Thompson Falls in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Prospect Creek At Thompson Falls crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Prospect Creek At Thompson Falls
Where does the streamflow data for Prospect Creek At Thompson Falls come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 12390700. Snoflo refreshes the time series throughout the day. Forecasts come from the NOAA / yr.no feed Snoflo's iOS app uses.
How often is the report updated?
USGS gauges report continuously (typically every 15 minutes). Snoflo pulls fresh values throughout the day — look for the "as of" timestamp on the streamflow hero card.
What's the difference between discharge and gage height?
Discharge (cubic feet per second, or cfs) is the volume of water flowing past the gauge each second. Gage height is how high the water sits at the gauge (feet). They're related by a rating curve specific to each gauge — higher water means more flow, but the exact ratio depends on channel shape.
How is "percent of median" calculated?
Today's discharge is compared to the historical median discharge on this calendar day across the gauge's full record. 100% = right on median; 200% = a very high year; 30% = a drought-level low.
What are flood stages, and is this river safe right now?
Flood stages are NWS-defined gage-height thresholds — Action, Minor, Moderate, Major — marking when nearby roads or floodplains start to be affected. "Safe" depends on your activity and skill: a level that's a fun paddle for an expert can be lethal for a wader. Always check the current level against the thresholds above and the safety links, and when in doubt, stay off the water.
Can I get alerts when Prospect Creek At Thompson Falls rises?
Yes — flow alerts are managed in the Snoflo iOS app. Favorite this gauge, set a streamflow threshold (e.g. "alert me when discharge crosses 5,000 cfs"), and you'll get a push the moment USGS reports the crossing.
Access the free Prospect Creek At Thompson Falls report
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