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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
77
Healthy
Drought index
10
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
33%
of 6 reporting
Median flow
98%
p47 of record
Water assets
3,787
63 springs · 1,461 wells
USGS gauges (6)
- Missouri River at Toston MT060545003,210 cfsp15 · below normal
- Missouri River bl Hauser Dam near Helena MT060655003,040 cfsp22 · below normal
- Prickly Pear Creek near Clancy MT0606150022 cfsp31 · normal
- Little Prickly Pear Cr at Wolf Cr MT0607130050 cfsp64 · normal
- Tenmile Creek near Helena MT0606300011 cfsp66 · normal
- Tenmile Creek near Rimini MT060625004 cfsp69 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 10 | 0 | 2/6 | p47 |
| 2026-10-19 | 10 | 0 | 2/6 | p47 |
| 2026-10-18 | 10 | 0 | 2/6 | p44 |
| 2026-10-17 | 10 | 0 | 2/6 | p39 |
| 2026-10-16 | 10 | 0 | 2/6 | p43 |
| 2026-10-15 | 35 | 0 | 2/6 | p40 |
| 2026-10-14 | 35 | 0 | 3/6 | p38 |
| 2026-10-13 | 35 | 0 | 2/6 | p38 |
| 2026-10-12 | 35 | 0 | 2/6 | p43 |
| 2026-10-11 | 35 | 0 | 3/6 | p27 |
| 2026-10-10 | 35 | 0 | 3/6 | p25 |
| 2026-10-09 | 35 | 0 | 3/6 | p24 |
| 2026-10-08 | 60 | 0 | 3/6 | p23 |
| 2026-10-07 | 60 | 0 | 3/6 | p23 |
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