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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
73
Moderate
Drought index
100
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 4 reporting
Median flow
159%
p80 of record
Water assets
1,698
22 springs · 595 wells
USGS gauges (7)
- West Fork Bitterroot River nr Conner MT12342500336 cfsp78 · above normal
- Bitterroot River near Missoula MT123525001,110 cfsp79 · above normal
- Bitterroot River near Darby MT12344000592 cfsp80 · above normal
- Bitterroot River at Bell Crossing nr Victor MT12350250648 cfsp82 · above normal
- Lake Como Spillway near Darby, MT123445010 cfsno long-term record
- Bitterroot Irrigation District Canal nr Darby, MT12345500278 cfsno long-term record
- Rock Cr bl canal diversion, near Darby, MT123455105 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 100 | 0 | 0/4 | p80 |
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