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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
76
Healthy
Drought index
100
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 5 reporting
Median flow
90%
p33 of record
Water assets
662
60 springs · 180 wells
USGS gauges (6)
- SNAKE RIVER AB JACKSON LAKE AT FLAGG RANCH WY13010065262 cfsp29 · normal
- Pacific Creek at Moran, WY1301150051 cfsp30 · normal
- BUFFALO FORK AB LAVA CREEK, NR MORAN, WY13011900187 cfsp33 · normal
- SNAKE RIVER NEAR MORAN, WY13011000285 cfsp50 · normal
- SNAKE RIVER AT MOOSE, WY130136501,020 cfsp52 · normal
- Blackrock Cr bl Split Rock Cr, nr Moran, WY1301182019 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-18 | 100 | 0 | 0/5 | p33 |
| 2026-10-17 | 100 | 0 | 0/5 | p34 |
| 2026-10-16 | 100 | 0 | 0/5 | p46 |
| 2026-10-15 | 100 | 0 | 0/5 | p52 |
| 2026-10-14 | 100 | 0 | 0/5 | p66 |
| 2026-10-13 | 100 | 0 | 0/5 | p77 |
| 2026-10-12 | 100 | 0 | 0/5 | p76 |
| 2026-10-11 | 100 | 0 | 3/5 | p22 |
| 2026-10-10 | 100 | 0 | 3/5 | p14 |
| 2026-10-09 | 100 | 0 | 3/5 | p14 |
| 2026-10-08 | 100 | 0 | 3/5 | p14 |
| 2026-10-07 | 100 | 0 | 3/5 | p14 |
| 2026-10-06 | 100 | 0 | 4/5 | p15 |
| 2026-10-05 | 100 | 0 | 4/5 | p14 |
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