USGS Streamgage 06126500
Musselshell River near Roundup, MT
Musselshell River near Roundup, MT is USGS streamgage 06126500 in Montana, monitoring river discharge in hydrologic subbasin 10040202. It drains a watershed of about 3,998 square miles. Discharge records at this site go back to 1946. Typical flow runs near 204.8 cfs in July and 81.1 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 3,998 sq mi
- Gauge elevation
- 3,193 ft
- Subbasin (HUC-8)
- 10040202
- Coordinates
- 46.42772, -108.5701
- USGS site number
- 06126500
- Records begin
- 1946-06-01 (80 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 79 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 | 10.9 | 40.8 | 150.2 | |
| February | 12.6 | 59.5 | 202.6 | |
| March | 21.3 | 97.3 | 410.6 | |
| April | 18.9 | 81.1 | 490.1 | |
| May | 49.6 | 204.8 | 1,075.9 | |
| June | 77 | 303.6 | 1,833 | |
| July | 61.9 | 204.8 | 705.5 | |
| August | 30.3 | 175.4 | 331.6 | |
| September | 12.4 | 101.7 | 255.6 | |
| October | 14.9 | 62.4 | 177.9 | |
| November | 14.3 | 57.4 | 177.9 | |
| December | 10.3 | 42.1 | 163.2 |
All values in cubic feet per second (cfs).