USGS Streamgage 06120500
Musselshell River at Harlowton, MT
Musselshell River at Harlowton, MT is USGS streamgage 06120500 in Montana, monitoring river discharge in hydrologic subbasin 10040201. It drains a watershed of about 1,108 square miles. Discharge records at this site go back to 1907. Typical flow runs near 111.8 cfs in July and 113.7 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 1,108 sq mi
- Gauge elevation
- 4,173 ft
- Subbasin (HUC-8)
- 10040201
- Coordinates
- 46.4288, -109.84119
- USGS site number
- 06120500
- Records begin
- 1907-08-01 (119 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 119 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 | 29.2 | 50.6 | 88.5 | |
| February | 29.7 | 56.7 | 108.5 | |
| March | 39.9 | 73.5 | 204.4 | |
| April | 39 | 113.7 | 364.8 | |
| May | 44.4 | 264.4 | 928.5 | |
| June | 61 | 320.2 | 1,171.2 | |
| July | 20.2 | 111.8 | 379.5 | |
| August | 1.6 | 61.3 | 163.6 | |
| September | 3.2 | 48.7 | 130.6 | |
| October | 15.9 | 66.5 | 136.7 | |
| November | 30.3 | 71.3 | 131.1 | |
| December | 29.4 | 59.7 | 108 |
All values in cubic feet per second (cfs).