Lower Clark Fork HUC8 17010213
A 6,052 km² sub-basin of the Pacific Northwest region in ID, 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
65
Moderate
Drought index
103
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
60%
of 5 reporting
Median flow
82%
p22 of record
Water assets
1,031
23 springs · 204 wells
USGS gauges (5)
- LIGHTNING CREEK AT CLARK FORK ID123921551 cfsp2 · much below normal
- Prospect Creek at Thompson Falls MT1239070035 cfsp16 · below normal
- Thompson River near Thompson Falls MT12389500134 cfsp22 · below normal
- CLARK FORK RIVER BELOW CABINET GORGE DAM ID123919509,320 cfsp49 · normal
- Clark Fork near Plains MT1238900010,100 cfsp50 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 103 | 0 | 3/5 | p22 |
| 2026-10-20 | 103 | 0 | 3/5 | p21 |
| 2026-10-19 | 103 | 0 | 4/5 | p13 |
| 2026-10-18 | 103 | 0 | 4/5 | p16 |
| 2026-10-17 | 103 | 0 | 4/5 | p16 |
| 2026-10-16 | 103 | 0 | 3/5 | p23 |
| 2026-10-15 | 103 | 0 | 3/5 | p24 |
| 2026-10-14 | 103 | 0 | 3/5 | p24 |
| 2026-10-13 | 103 | 0 | 3/5 | p24 |
| 2026-10-12 | 103 | 0 | 3/5 | p24 |
| 2026-10-11 | 103 | 0 | 4/5 | p20 |
| 2026-10-10 | 103 | 0 | 4/5 | p16 |
| 2026-10-09 | 103 | 0 | 4/5 | p15 |
| 2026-10-08 | 115 | 0 | 3/5 | p22 |
Top water assets
- 69Bighorn Creekriver
- 69Bighorn Creekriver
- 67Cherry Creekriver
- 67Cabinet Gorgereservoir
- 67Noxon Rapidsreservoir
- 67Clark Fork Near Plains Mtriver
- 67Thompson River Near Thompson Falls Mtriver
- 67West Fork Combest Creekriver
- 67Clark Fork River Below Cabinet Gorge Dam Idriver
- 67Graves Creekriver