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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
71
Moderate
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
50%
of 16 reporting
Median flow
79%
p24 of record
Water assets
1,196
70 springs · 588 wells
USGS gauges (18)
- Lost Creek near Galen, MT1232385014 cfsp5 · much below normal
- Silver Bow Creek at Opportunity MT1232360023 cfsp9 · much below normal
- Willow Creek at Opportunity, MT123237204 cfsp10 · much below normal
- Silver Bow Creek at Warm Springs MT1232375031 cfsp12 · below normal
- Mill Creek nr Anaconda, MT1232367011 cfsp16 · below normal
- Clark Fork ab Little Blackfoot R nr Garrison MT12324400183 cfsp17 · below normal
- Clark Fork at Goldcreek MT12324680291 cfsp20 · below normal
- Clark Fork at Deer Lodge MT12324200174 cfsp23 · below normal
- Warm Springs Creek near Anaconda MT1232376058 cfsp26 · normal
- Clark Fork near Galen MT1232380083 cfsp36 · normal
- Little Blackfoot River near Garrison MT1232459067 cfsp39 · normal
- Mill Creek at Opportunity, MT123237006 cfsp41 · normal
- Lost Creek near Anaconda MT123238406 cfsp45 · normal
- Warm Springs Creek at Warm Springs MT1232377046 cfsp52 · normal
- Willow Creek nr Anaconda, MT123237102 cfsp55 · normal
- Silver Bow Cr bl Blacktail Cr, at Butte, MT1232325025 cfsp75 · above normal
- Blacktail Creek above Grove Gulch, at Butte, MT123232338 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 |
|---|---|---|---|---|
| 2026-10-20 | 0 | 0 | 8/16 | p24 |
| 2026-10-19 | 0 | 0 | 7/16 | p27 |
| 2026-10-18 | 0 | 0 | 7/16 | p28 |
| 2026-10-17 | 0 | 0 | 5/16 | p30 |
| 2026-10-16 | 0 | 0 | 4/16 | p34 |
| 2026-10-15 | 0 | 0 | 3/16 | p40 |
| 2026-10-14 | 0 | 0 | 4/16 | p35 |
| 2026-10-13 | 0 | 0 | 3/16 | p34 |
| 2026-10-12 | 0 | 0 | 4/16 | p33 |
| 2026-10-11 | 0 | 0 | 7/16 | p30 |
| 2026-10-10 | 0 | 0 | 10/16 | p16 |
| 2026-10-09 | 0 | 0 | 10/16 | p14 |
| 2026-10-08 | 61 | 0 | 11/16 | p14 |
| 2026-10-07 | 61 | 0 | 11/16 | p16 |
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