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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
60
Moderate
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
100%
of 2 reporting
Median flow
60%
p15 of record
Water assets
301
12 springs · 111 wells
USGS gauges (4)
- LEMHI RIVER NR LEMHI ID13305000150 cfsp9 · much below normal
- LEMHI RIVER BELOW L5 DIVERSION NEAR SALMON, ID13305310160 cfsp20 · below normal
- Big Timber Creek Abv Mouth at Leadore ID133040506 cfsno long-term record
- Lemhi River near McFarland, ID1330470095 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 0 | 0 | 2/2 | p15 |
| 2026-10-19 | 0 | 0 | 2/2 | p15 |
| 2026-10-18 | 0 | 0 | 2/2 | p16 |
| 2026-10-17 | 0 | 0 | 1/2 | p21 |
| 2026-10-16 | 0 | 0 | 1/2 | p21 |
| 2026-10-15 | 45 | 0 | 1/2 | p24 |
| 2026-10-14 | 45 | 0 | 1/2 | p23 |
| 2026-10-13 | 45 | 0 | 1/2 | p24 |
| 2026-10-12 | 45 | 0 | 1/2 | p21 |
| 2026-10-11 | 45 | 0 | 2/2 | p13 |
| 2026-10-10 | 45 | 0 | 2/2 | p13 |
| 2026-10-09 | 45 | 0 | 2/2 | p12 |
| 2026-10-08 | 59 | 0 | 2/2 | p12 |
| 2026-10-07 | 59 | 0 | 2/2 | p11 |
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