USGS Streamgage 12342500
West Fork Bitterroot River near Conner, MT
West Fork Bitterroot River near Conner, MT is USGS streamgage 12342500 in Montana, monitoring river discharge in hydrologic subbasin 17010205. It drains a watershed of about 317 square miles. Discharge records at this site go back to 1941. Typical flow runs near 237.2 cfs in July and 148.7 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 317 sq mi
- Gauge elevation
- 4,671 ft
- Subbasin (HUC-8)
- 17010205
- Coordinates
- 45.72483, -114.28229
- USGS site number
- 12342500
- Records begin
- 1941-05-01 (85 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 84 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 | 50.5 | 69.4 | 113.9 | |
| February | 50.9 | 68 | 113.4 | |
| March | 54.3 | 75.9 | 148.1 | |
| April | 63.9 | 148.7 | 432.3 | |
| May | 204.5 | 695.3 | 1,674.7 | |
| June | 346.4 | 777.4 | 1,609.2 | |
| July | 136.9 | 237.2 | 433.8 | |
| August | 103.8 | 232.7 | 359.9 | |
| September | 78.7 | 173.2 | 316.1 | |
| October | 59.4 | 94.5 | 291.3 | |
| November | 57.2 | 79.8 | 168.1 | |
| December | 53.8 | 72.3 | 120.6 |
All values in cubic feet per second (cfs).