Bitterroot HUC8 17010205
A 7,402 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
72
Moderate
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
50%
of 4 reporting
Median flow
78%
p27 of record
Water assets
1,698
22 springs · 595 wells
USGS gauges (7)
- West Fork Bitterroot River nr Conner MT1234250058 cfsp10 · much below normal
- Bitterroot River near Darby MT12344000200 cfsp13 · below normal
- Bitterroot River at Bell Crossing nr Victor MT12350250415 cfsp40 · normal
- Bitterroot River near Missoula MT12352500799 cfsp40 · normal
- Lake Como Spillway near Darby, MT12344501no readingno long-term record
- Bitterroot Irrigation District Canal nr Darby, MT12345500no readingno long-term record
- Rock Cr bl canal diversion, near Darby, MT12345510no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-22 | 0 | 0 | 2/4 | p27 |
| 2026-10-21 | 0 | 0 | 2/4 | p24 |
| 2026-10-20 | 0 | 0 | 2/4 | p27 |
| 2026-10-19 | 0 | 0 | 2/4 | p32 |
| 2026-10-18 | 0 | 0 | 1/4 | p37 |
| 2026-10-17 | 0 | 0 | 0/4 | p44 |
| 2026-10-16 | 0 | 0 | 0/4 | p44 |
| 2026-10-15 | 0 | 0 | 0/4 | p43 |
| 2026-10-14 | 0 | 0 | 0/4 | p43 |
| 2026-10-13 | 0 | 0 | 0/4 | p44 |
| 2026-10-12 | 0 | 0 | 0/4 | p44 |
| 2026-10-11 | 0 | 0 | 1/4 | p40 |
| 2026-10-10 | 0 | 0 | 1/4 | p38 |
| 2026-10-09 | 0 | 0 | 1/4 | p37 |
Top water assets
- 69Wiles Creekriver
- 69Tolan Creekriver
- 69Woods Creekriver
- 69Gold Creekriver
- 69Overwhich Creekriver
- 69Divide Creekriver
- 69Bertie Lord Creekriver
- 69Warm Springs Creekriver
- 69Blue Joint Creekriver
- 69Mine Creekriver