USGS Streamgage 12354500
Clark Fork at St. Regis, MT
Clark Fork at St. Regis, MT is USGS streamgage 12354500 in Montana, monitoring river discharge in hydrologic subbasin 17010204. It drains a watershed of about 10,728 square miles. Discharge records at this site go back to 1910. Typical flow runs near 6,787.4 cfs in July and 8,135 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 10,728 sq mi
- Gauge elevation
- 2,611 ft
- Subbasin (HUC-8)
- 17010204
- Coordinates
- 47.30164, -115.08687
- USGS site number
- 12354500
- Records begin
- 1910-11-01 (116 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 96 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 | 1,922.9 | 2,721.6 | 4,549 | |
| February | 2,071 | 2,972.1 | 5,287.2 | |
| March | 2,572.3 | 3,755.8 | 7,113.9 | |
| April | 4,046 | 8,135 | 16,196.7 | |
| May | 10,045.2 | 18,045.2 | 33,067.7 | |
| June | 9,141.3 | 19,320 | 35,590 | |
| July | 3,180 | 6,787.4 | 12,353.9 | |
| August | 1,849.7 | 2,908.7 | 4,530 | |
| September | 1,865.3 | 2,787.7 | 4,053.3 | |
| October | 2,209.4 | 3,157.7 | 4,529.7 | |
| November | 2,374.3 | 3,274.3 | 5,131.7 | |
| December | 2,083.9 | 2,970.3 | 4,784.5 |
All values in cubic feet per second (cfs).