Upper Snake-Rock HUC8 17040212
A 6,602 km² sub-basin of the Pacific Northwest region in ID. 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
28
Critical
Drought index
418
Exceptional
Area in D2+
100%
18.4% exceptional (D4)
Gauges below normal
100%
of 7 reporting
Median flow
79%
p10 of record
Water assets
4,635
234 springs · 3,808 wells
USGS gauges (13)
- SNAKE RIVER NR BUHL ID130940001,860 cfsp9 · much below normal
- BOX CANYON SPRINGS NR WENDELL ID13095500305 cfsp10 · much below normal
- SNAKE RIVER NR TWIN FALLS ID13090500523 cfsp10 · much below normal
- SNAKE RIVER GAGING STATION AT MILNER ID130879950 cfsp10 · below normal
- BRIGGS SPRING AT HEAD NEAR BUHL ID1309517587 cfsp10 · below normal
- ROCK CREEK AB HWY 30/93 XING AT TWIN FALLS ID13092747121 cfsp15 · below normal
- DEVILS WASHBOWL SPRING NR KIMBERLY 10S 18E 04AAD1S130895009 cfsp21 · below normal
- LOWER MILNER POWER PLANT AT MILNER ID130875051,050 cfsno long-term record
- SNAKE RIVER NR KIMBERLY ID13090000880 cfsno long-term record
- SNAKE RIVER AT PIGEON COVE NR TWIN FALLS, ID130933831,080 cfsno long-term record
- N CHANNEL SNAKE R UPPER SALMON FALLS NR HAGERMAN1313455679 cfsno long-term record
- SNAKE RIVER BL LOWER SALMON FALLS NR HAGERMAN ID131350005,330 cfsno long-term record
- SNAKE RIVER BL BLISS DAM NR BLISS ID131537766,770 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 418 | 100 | 7/7 | p10 |
Top water assets
- 94Snake River Artesian Belt — Deep Aquiferaquifer
- 72Eastern Snake River Plain Aquifer — Twin Falls Regionaquifer
- 69Third Fork Rock Creekriver
- 69Big Cottonwood Creekriver
- 69Big Cottonwood Creekriver
- 69Big Cottonwood Creekriver
- 69Third Fork Rock Creekriver
- 69Fourth Fork Rock Creekriver
- 69Big Cottonwood Creekriver
- 69Rock Creekriver