Upper Clark Fork HUC8 17010201
A 4,856 km² sub-basin of the Pacific Northwest 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
74
Moderate
Drought index
98
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
6%
of 16 reporting
Median flow
107%
p53 of record
Water assets
1,196
70 springs · 588 wells
USGS gauges (18)
- Silver Bow Creek at Opportunity MT1232360019 cfsp22 · below normal
- Willow Creek at Opportunity, MT123237205 cfsp31 · normal
- Silver Bow Creek at Warm Springs MT1232375034 cfsp36 · normal
- Silver Bow Cr bl Blacktail Cr, at Butte, MT1232325016 cfsp37 · normal
- Mill Creek nr Anaconda, MT1232367015 cfsp44 · normal
- Clark Fork ab Little Blackfoot R nr Garrison MT12324400144 cfsp46 · normal
- Willow Creek nr Anaconda, MT123237102 cfsp48 · normal
- Clark Fork at Goldcreek MT12324680229 cfsp50 · normal
- Lost Creek near Anaconda MT123238402 cfsp55 · normal
- Lost Creek near Galen, MT1232385014 cfsp57 · normal
- Clark Fork at Deer Lodge MT12324200156 cfsp60 · normal
- Little Blackfoot River near Garrison MT1232459049 cfsp65 · normal
- Clark Fork near Galen MT1232380093 cfsp69 · normal
- Warm Springs Creek near Anaconda MT1232376099 cfsp69 · normal
- Mill Creek at Opportunity, MT123237005 cfsp72 · normal
- Warm Springs Creek at Warm Springs MT1232377059 cfsp76 · above normal
- Blacktail Creek above Grove Gulch, at Butte, MT123232334 cfsno long-term record
- Silver Bow Creek at Montana Street, at Butte, MT123232426 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 98 | 0 | 1/16 | p53 |
Top water assets
- 69Blacktail Creek Above Grove Gulch, At Butte, Mtriver
- 69Ontario Creekriver
- 69Mill Creek Nr Anaconda, Mtriver
- 69Silver Bow Cr Bl Blacktail Cr, At Butte, Mtriver
- 69Silver Bow Creek At Montana Street, At Butte, Mtriver
- 69Basin Creekriver
- 69Lost Creek Near Anaconda Mtriver
- 69Willow Creek Nr Anaconda, Mtriver
- 69Warm Springs Creek Near Anaconda Mtriver
- 69Foster Creekriver