Greys-Hoback HUC8 17040103
A 4,097 km² sub-basin of the Pacific Northwest region in ID, 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
55
Moderate
Drought index
213
Severe
Area in D2+
12.44%
0% exceptional (D4)
Gauges below normal
63%
of 8 reporting
Median flow
73%
p17 of record
Water assets
571
133 springs · 196 wells
USGS gauges (8)
- FLAT CREEK BELOW CACHE CREEK, NEAR JACKSON, WY1301835034 cfsp14 · below normal
- HOBACK RIVER NEAR JACKSON, WY13019500228 cfsp14 · below normal
- GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY13023000272 cfsp14 · below normal
- FISH CREEK AT WILSON, WY13016450214 cfsp16 · below normal
- CACHE CREEK NEAR JACKSON, WY130183006 cfsp18 · below normal
- GRANITE C AB GRANITE C SUPPLEMENTAL, NR MOOSE, WY1301630514 cfsp64 · normal
- SNAKE RIVER ABOVE RESERVOIR, NEAR ALPINE, WY130225006,380 cfsp79 · above normal
- SNAKE RIVER BELOW FLAT CREEK, NEAR JACKSON, WY130187506,190 cfsp83 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 213 | 12.44 | 5/8 | p17 |
Top water assets
- 69Greys Riverriver
- 69Greys River Above Reservoir, Near Alpine, Wyriver
- 69Fish Creek At Wilson, Wyriver
- 69Granite C Ab Granite C Supplemental, Nr Moose, Wyriver
- 69Hoback River Near Jackson, Wyriver
- 69Snake River Below Flat Creek, Near Jackson, Wyriver
- 69Flat Creek Below Cache Creek, Near Jackson, Wyriver
- 69Snake River Above Reservoir, Near Alpine, Wyriver
- 69Cache Creek Near Jackson, Wyriver
- 69Greys Riverriver