Big Hole HUC8 10020004
A 7,228 km² sub-basin of the Missouri region in ID, 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
79
Healthy
Drought index
125
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 6 reporting
Median flow
86%
p41 of record
Water assets
2,304
38 springs · 106 wells
USGS gauges (7)
- Big Hole River near Melrose MT06025500235 cfsp33 · normal
- Big Hole River near Glen MT06026210225 cfsp33 · normal
- Big Hole River bl Big Lake Cr at Wisdom MT0602445022 cfsp37 · normal
- Big Hole R bl Hamilton Ditch nr Twin Bridges, MT06026420124 cfsp45 · normal
- Big Hole River at Maiden Rock nr Divide MT06025250289 cfsp47 · normal
- Big Hole River bl Mudd Cr nr Wisdom MT06024540104 cfsp51 · normal
- Big Hole River near Wise River MT06024580443 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 125 | 0 | 0/6 | p41 |
Top water assets
- 69Big Hole River Bl Big Lake Cr At Wisdom Mtriver
- 69Smith (Madison)reservoir
- 69Big Hole River Near Wise River Mtriver
- 69Howell Creekriver
- 69Plimpton Creekriver
- 69Big Hole River Bl Mudd Cr Nr Wisdom Mtriver
- 69Big Hole Riverriver
- 69Bear Creekriver
- 69Pintler Creekriver
- 69Bull Creekriver