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 2026-10-20); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
50
Moderate
Drought index
124
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
100%
of 2 reporting
Median flow
13%
p6 of record
Water assets
579
52 springs · 283 wells
USGS gauges (2)
- HENRYS FORK NR LAKE ID130395000 cfsp1 · much below normal
- HENRYS FORK NR ISLAND PARK ID1304250090 cfsp11 · below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-23 | 124 | 0 | 2/2 | p6 |
| 2026-10-22 | 124 | 0 | 2/2 | p9 |
| 2026-10-21 | 124 | 0 | 2/2 | p6 |
| 2026-10-20 | 124 | 0 | 2/2 | p6 |
| 2026-10-19 | 124 | 0 | 2/2 | p6 |
| 2026-10-18 | 124 | 0 | 2/2 | p5 |
| 2026-10-17 | 124 | 0 | 2/2 | p6 |
| 2026-10-16 | 124 | 0 | 2/2 | p6 |
| 2026-10-15 | 219 | 22.02 | 2/2 | p6 |
| 2026-10-14 | 219 | 22.02 | 2/2 | p6 |
| 2026-10-13 | 219 | 22.02 | 2/2 | p5 |
| 2026-10-12 | 219 | 22.02 | 2/2 | p6 |
| 2026-10-11 | 219 | 22.02 | 2/2 | p8 |
| 2026-10-10 | 219 | 22.02 | 2/2 | p8 |
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