USGS Streamgage 12340500
Clark Fork above Missoula, MT
Clark Fork above Missoula, MT is USGS streamgage 12340500 in Montana, monitoring river discharge in hydrologic subbasin 17010204. It drains a watershed of about 6,021 square miles. Discharge records at this site go back to 1908. Typical flow runs near 2,782.9 cfs in July and 3,244 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 6,021 sq mi
- Gauge elevation
- 3,204 ft
- Subbasin (HUC-8)
- 17010204
- Coordinates
- 46.87676, -113.93212
- USGS site number
- 12340500
- Records begin
- 1908-06-01 (118 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 97 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 | 810.1 | 1,249 | 1,887.7 | |
| February | 919.6 | 1,337.6 | 2,102.8 | |
| March | 1,192.9 | 1,666.5 | 2,943.5 | |
| April | 1,758.3 | 3,244 | 6,629 | |
| May | 3,868.4 | 7,159 | 13,604.5 | |
| June | 3,306.3 | 7,329.7 | 14,541 | |
| July | 1,342.6 | 2,782.9 | 5,259.7 | |
| August | 840.7 | 1,400 | 2,199.4 | |
| September | 846.4 | 1,336.3 | 1,947.7 | |
| October | 1,078.9 | 1,480.6 | 2,034.8 | |
| November | 1,111.2 | 1,504.7 | 2,055.7 | |
| December | 906.8 | 1,337.7 | 1,876.5 |
All values in cubic feet per second (cfs).