Upper Missouri HUC8 10030101
A 8,677 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
72
Moderate
Drought index
65
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
33%
of 6 reporting
Median flow
83%
p36 of record
Water assets
3,787
63 springs · 1,461 wells
USGS gauges (6)
- Prickly Pear Creek near Clancy MT0606150010 cfsp9 · much below normal
- Missouri River at Toston MT060545001,670 cfsp19 · below normal
- Little Prickly Pear Cr at Wolf Cr MT0607130027 cfsp30 · normal
- Missouri River bl Hauser Dam near Helena MT060655003,280 cfsp42 · normal
- Tenmile Creek near Rimini MT060625001 cfsp52 · normal
- Tenmile Creek near Helena MT060630002 cfsp58 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 65 | 0 | 2/6 | p36 |
Top water assets
- 69Russell Fork Deep Creekriver
- 69Beaver Creekriver
- 69Hay Creekriver
- 69Spring Creekriver
- 69South Fork Crow Creekriver
- 69Sherlock Creekriver
- 69Gurnett Creekriver
- 69Indian Creekriver
- 69South Fork Crow Creekriver
- 69Little Tizer Creekriver