USGS Streamgage 12390700
Prospect Creek at Thompson Falls, MT
Prospect Creek at Thompson Falls, MT is USGS streamgage 12390700 in Montana, monitoring river discharge in hydrologic subbasin 17010213. It drains a watershed of about 182 square miles. Discharge records at this site go back to 1956. Typical flow runs near 133.4 cfs in July and 391.5 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 182 sq mi
- Gauge elevation
- 2,429 ft
- Subbasin (HUC-8)
- 17010213
- Coordinates
- 47.58606, -115.3551
- USGS site number
- 12390700
- Records begin
- 1956-04-01 (70 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 70 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 38.3 | 71.3 | 214.7 | |
| February | 39.7 | 94.6 | 313.2 | |
| March | 55.5 | 165.4 | 461.1 | |
| April | 181.8 | 391.5 | 851.6 | |
| May | 321.5 | 677.4 | 1,285.2 | |
| June | 166.8 | 415.1 | 936.4 | |
| July | 83.2 | 133.4 | 262.5 | |
| August | 54.4 | 80.6 | 103.8 | |
| September | 40.6 | 60.9 | 74.3 | |
| October | 33.7 | 50.5 | 63.6 | |
| November | 33.1 | 47.9 | 139.9 | |
| December | 36.5 | 58 | 220.8 |
All values in cubic feet per second (cfs).