Middle Musselshell HUC8 10040202
A 4,984 km² sub-basin of the Missouri region in MT. Drought coverage is from the US Drought Monitor (map of 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
67
Moderate
Drought index
246
Severe
Area in D2+
45.62%
0% exceptional (D4)
Gauges below normal
0%
of 2 reporting
Median flow
64%
p33 of record
Water assets
1,235
154 springs · 245 wells
USGS gauges (2)
- Musselshell River at Musselshell MT0612750055 cfsp33 · normal
- Musselshell River near Roundup MT0612650077 cfsp33 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 246 | 45.62 | 0/2 | p33 |
Top water assets
- 67Fattig Creekriver
- 67Fattig Creekriver
- 67Musselshell River At Musselshell Mtriver
- 67Musselshell River Near Roundup Mtriver
- 67Little Wall Creekriver
- 67North Willow Creekriver
- 67Willow Creekriver
- 67Musselshell Riverriver
- 67Willow Creekriver
- 67Willow Creekriver