Upper Henrys HUC8 17040202
A 2,838 km² sub-basin of the Pacific Northwest region in ID, MT, 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
62
Moderate
Drought index
244
Severe
Area in D2+
35.6%
0% exceptional (D4)
Gauges below normal
0%
of 2 reporting
Median flow
221%
p83 of record
Water assets
579
52 springs · 283 wells
USGS gauges (2)
- HENRYS FORK NR ISLAND PARK ID130425001,210 cfsp79 · above normal
- HENRYS FORK NR LAKE ID13039500173 cfsp87 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 244 | 35.6 | 0/2 | p83 |
Top water assets
- 69Buffalo Riverriver
- 69Taylor Creekriver
- 69Henrys Fork Nr Lake Idriver
- 69West Fork Hotel Creekriver
- 69Buffalo Riverriver
- 69Henrys Forkriver
- 69Moose Creekriver
- 69Bootjack Creekriver
- 69Henrys Fork Nr Island Park Idriver
- 69Middle Fork Split Creekriver