Lower Henrys HUC8 17040203
A 2,915 km² sub-basin of the Pacific Northwest region in ID, 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
46
Stressed
Drought index
191
Moderate
Area in D2+
23.4%
0% exceptional (D4)
Gauges below normal
86%
of 7 reporting
Median flow
73%
p10 of record
Water assets
749
13 springs · 524 wells
USGS gauges (7)
- HENRYS FORK NR ASHTON ID13046000629 cfsp8 · much below normal
- HENRYS FORK NR REXBURG ID13056500858 cfsp8 · much below normal
- FALL RIVER AB YELLOWSTONE CANAL NR SQUIRREL ID13046995427 cfsp10 · much below normal
- FALL RIVER NR SQUIRREL ID13047500212 cfsp10 · much below normal
- HENRYS FORK AT ST ANTHONY ID13050500837 cfsp10 · below normal
- FALL RIVER NR ASHTON ID13047600445 cfsp13 · below normal
- FALL RIVER NR CHESTER ID13049500411 cfsp31 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 191 | 23.4 | 6/7 | p10 |
| 2026-10-20 | 191 | 23.4 | 6/7 | p10 |
| 2026-10-19 | 191 | 23.4 | 6/7 | p10 |
| 2026-10-18 | 191 | 23.4 | 6/7 | p10 |
| 2026-10-17 | 191 | 23.4 | 6/7 | p10 |
| 2026-10-16 | 191 | 23.4 | 6/7 | p13 |
| 2026-10-15 | 269 | 64.93 | 6/7 | p12 |
| 2026-10-14 | 269 | 64.93 | 5/7 | p19 |
| 2026-10-13 | 269 | 64.93 | 3/7 | p29 |
| 2026-10-12 | 269 | 64.93 | 3/7 | p56 |
| 2026-10-11 | 269 | 64.93 | 5/7 | p19 |
| 2026-10-10 | 269 | 64.93 | 6/7 | p10 |
| 2026-10-09 | 269 | 64.93 | 6/7 | p10 |
| 2026-10-08 | 277 | 69.34 | 6/7 | p10 |
Top water assets
- 69Conant Creekriver
- 69Boundary Creekriver
- 69Fall Riverriver
- 69Fall River Nr Squirrel Idriver
- 69Fall River Ab Yellowstone Canal Nr Squirrel Idriver
- 69Squirrel Creekriver
- 69Fall River Nr Ashton Idriver
- 69Henrys Fork Nr Ashton Idriver
- 69Fall River Nr Chester Idriver
- 69Conant Creekriver