Snake Headwaters HUC8 17040101
A 4,431 km² sub-basin of the Pacific Northwest region in WY. 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
60
Moderate
Drought index
200
Severe
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
40%
of 5 reporting
Median flow
91%
p35 of record
Water assets
662
60 springs · 180 wells
USGS gauges (6)
- Pacific Creek at Moran, WY1301150043 cfsp11 · below normal
- SNAKE RIVER AB JACKSON LAKE AT FLAGG RANCH WY13010065224 cfsp23 · below normal
- BUFFALO FORK AB LAVA CREEK, NR MORAN, WY13011900217 cfsp35 · normal
- SNAKE RIVER AT MOOSE, WY130136505,310 cfsp81 · above normal
- SNAKE RIVER NEAR MORAN, WY130110004,920 cfsp82 · above normal
- Blackrock Cr bl Split Rock Cr, nr Moran, WY1301182019 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 200 | 0 | 2/5 | p35 |
Top water assets
- 69South Fork Spread Creekriver
- 69Snake River Ab Jackson Lake At Flagg Ranch Wyriver
- 69Buffalo Forkriver
- 69Blackrock Creekriver
- 69Blackrock Cr Bl Split Rock Cr, Nr Moran, Wyriver
- 69Snake River Near Moran, Wyriver
- 69Buffalo Fork Ab Lava Creek, Nr Moran, Wyriver
- 69Snake River At Moose, Wyriver
- 69Pacific Creek At Moran, Wyriver
- 69Aster Creekriver