Lemhi HUC8 17060204
A 3,267 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
75
Healthy
Drought index
137
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 2 reporting
Median flow
91%
p40 of record
Water assets
301
12 springs · 111 wells
USGS gauges (4)
- LEMHI RIVER NR LEMHI ID1330500099 cfsp31 · normal
- LEMHI RIVER BELOW L5 DIVERSION NEAR SALMON, ID1330531026 cfsp50 · normal
- Big Timber Creek Abv Mouth at Leadore ID133040504 cfsno long-term record
- Lemhi River near McFarland, ID1330470067 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 137 | 0 | 0/2 | p40 |
Top water assets
- 69Big Eightmile Creekriver
- 69Pattee Creekriver
- 69Bear Valley Creekriver
- 69Bear Valley Creekriver
- 69Eighteenmile Creekriver
- 69Peterson Creekriver
- 69Lemhi River Near Mcfarland, Idriver
- 69Lemhi Riverriver
- 69Big Timber Creek Abv Mouth At Leadore Idriver
- 69Big Bear Creekriver