USGS Streamgage 06018500
Beaverhead River near Twin Bridges, MT
Beaverhead River near Twin Bridges, MT is USGS streamgage 06018500 in Montana, monitoring river discharge in hydrologic subbasin 10020002. It drains a watershed of about 3,618 square miles. Discharge records at this site go back to 1935. Typical flow runs near 138.5 cfs in July and 379.2 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 3,618 sq mi
- Gauge elevation
- 4,818 ft
- Subbasin (HUC-8)
- 10020002
- Coordinates
- 45.38339, -112.45283
- USGS site number
- 06018500
- Records begin
- 1935-08-21 (91 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 91 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 | 195.1 | 381 | 534.3 | |
| February | 205.1 | 391.5 | 549.1 | |
| March | 240 | 423.9 | 609.9 | |
| April | 138.9 | 379.2 | 749.7 | |
| May | 52.6 | 169.4 | 660.8 | |
| June | 47.8 | 163.4 | 865.2 | |
| July | 48.5 | 138.5 | 510 | |
| August | 63.4 | 146.4 | 409.1 | |
| September | 95.8 | 245.9 | 644.7 | |
| October | 164.1 | 347.6 | 732.1 | |
| November | 243.9 | 484 | 750 | |
| December | 214.7 | 436.2 | 655.9 |
All values in cubic feet per second (cfs).