Gallatin HUC8 10020008
A 4,785 km² sub-basin of the Missouri region in MT, WY. 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
63
Moderate
Drought index
184
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
25%
of 4 reporting
Median flow
87%
p35 of record
Water assets
2,141
88 springs · 1,162 wells
USGS gauges (5)
- Gallatin River near Gallatin Gateway, MT06043500376 cfsp10 · much below normal
- Gallatin River at Logan MT06052500378 cfsp26 · normal
- Hyalite C at Hyalite R S nr Bozeman MT0605000046 cfsp45 · normal
- E Gallatin R ab Water Reclamation Fa nr Bozeman MT0604865040 cfsp50 · normal
- Gallatin River above Deer Creek, near Big Sky, MT06043120255 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 184 | 0 | 1/4 | p35 |
Top water assets
- 69Little Wapiti Creekriver
- 69Bridger Creekriver
- 69Tepee Creekriver
- 69Gallatin Riverriver
- 69Wapiti Creekriver
- 69Gallatin River Near Gallatin Gateway, Mtriver
- 69Gallatin River Above Deer Creek, Near Big Sky, Mtriver
- 69Gallatin Riverriver
- 69Hyalite C At Hyalite R S Nr Bozeman Mtriver
- 69North Fork West Fork Gallatin Riverriver