Lower Musselshell HUC8 10040205
A 4,376 km² sub-basin of the Missouri region in MT. Drought coverage is from the US Drought Monitor (map of 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
79
Healthy
Drought index
13
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
—
no gauges reporting
Median flow
—
of normal for the date
Water assets
907
0 springs · 44 wells
USGS gauges (1)
- Musselshell River at Mosby MT06130500no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 13 | 0 | — | — |
| 2026-10-19 | 13 | 0 | 0/1 | p45 |
| 2026-10-18 | 13 | 0 | 0/1 | p54 |
| 2026-10-17 | 13 | 0 | 0/1 | p55 |
| 2026-10-16 | 13 | 0 | 0/1 | p50 |
| 2026-10-15 | 69 | 0 | 0/1 | p49 |
| 2026-10-14 | 69 | 0 | 0/1 | p49 |
| 2026-10-13 | 69 | 0 | 0/1 | p51 |
| 2026-10-12 | 69 | 0 | 0/1 | p50 |
| 2026-10-11 | 69 | 0 | 0/1 | p41 |
| 2026-10-10 | 69 | 0 | 0/1 | p41 |
| 2026-10-09 | 69 | 0 | 0/1 | p41 |
| 2026-10-08 | 86 | 0 | 0/1 | p42 |
| 2026-10-07 | 86 | 0 | 0/1 | p43 |
Top water assets
- 67Blood Creekriver
- 67Blood Creekriver
- 67Calf Creekriver
- 67Blood Creekriver
- 67Fort Peck Lakeriver
- 67South Fork Lodgepole Creekriver
- 67Blood Creekriver
- 67Musselshell River At Mosby Mtriver
- 67Sacagawea Riverriver
- 67South Fork Lodgepole Creekriver