USGS Streamgage 12344000
Bitterroot River near Darby, MT
Bitterroot River near Darby, MT is USGS streamgage 12344000 in Montana, monitoring river discharge in hydrologic subbasin 17010205. It drains a watershed of about 1,050 square miles. Discharge records at this site go back to 1937. Typical flow runs near 862 cfs in July and 866.1 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 1,050 sq mi
- Gauge elevation
- 3,951 ft
- Subbasin (HUC-8)
- 17010205
- Coordinates
- 45.97205, -114.14123
- USGS site number
- 12344000
- Records begin
- 1937-04-01 (89 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 89 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 | 160.7 | 227.9 | 363 | |
| February | 163.9 | 237.8 | 398.9 | |
| March | 204.6 | 311.5 | 616.9 | |
| April | 374.3 | 866.1 | 1,792.7 | |
| May | 1,294.3 | 2,579 | 5,092.3 | |
| June | 1,310.2 | 2,743 | 5,148 | |
| July | 432.6 | 862 | 1,572.6 | |
| August | 264.7 | 428 | 606.4 | |
| September | 211.1 | 335.6 | 526.1 | |
| October | 188.9 | 290.2 | 537.8 | |
| November | 193.7 | 272.5 | 487 | |
| December | 162.3 | 237.6 | 429.2 |
All values in cubic feet per second (cfs).