American Falls HUC8 17040206
A 5,593 km² sub-basin of the Pacific Northwest region in ID. 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
400
Exceptional
Area in D2+
100%
0% exceptional (D4)
Gauges below normal
0%
of 3 reporting
Median flow
126%
p66 of record
Water assets
2,230
93 springs · 1,821 wells
USGS gauges (3)
- SNAKE RIVER AT BLACKFOOT ID130625002,890 cfsp56 · normal
- SNAKE RIVER NR BLACKFOOT ID130695002,710 cfsp66 · normal
- SNAKE RIVER NR SHELLEY ID130600005,210 cfsp75 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 400 | 100 | 0/3 | p66 |
Top water assets
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