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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
54
Moderate
Drought index
318
Extreme
Area in D2+
69.38%
0% exceptional (D4)
Gauges below normal
29%
of 7 reporting
Median flow
104%
p57 of record
Water assets
749
13 springs · 524 wells
USGS gauges (7)
- FALL RIVER AB YELLOWSTONE CANAL NR SQUIRREL ID13046995443 cfsp15 · below normal
- FALL RIVER NR ASHTON ID13047600435 cfsp16 · below normal
- FALL RIVER NR SQUIRREL ID13047500223 cfsp30 · normal
- HENRYS FORK NR ASHTON ID130460001,700 cfsp57 · normal
- FALL RIVER NR CHESTER ID13049500365 cfsp59 · normal
- HENRYS FORK NR REXBURG ID130565001,660 cfsp74 · normal
- HENRYS FORK AT ST ANTHONY ID130505001,800 cfsp80 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 318 | 69.38 | 2/7 | p57 |
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