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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
56
Moderate
Drought index
373
Extreme
Area in D2+
100%
0% exceptional (D4)
Gauges below normal
0%
of 3 reporting
Median flow
88%
p37 of record
Water assets
2,230
93 springs · 1,821 wells
USGS gauges (3)
- SNAKE RIVER AT BLACKFOOT ID130625001,970 cfsp32 · normal
- SNAKE RIVER NR SHELLEY ID130600002,600 cfsp37 · normal
- SNAKE RIVER NR BLACKFOOT ID130695002,440 cfsp44 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 373 | 100 | — | — |
| 2026-10-19 | 373 | 100 | 0/3 | p37 |
| 2026-10-18 | 373 | 100 | 0/3 | p43 |
| 2026-10-17 | 373 | 100 | 0/3 | p52 |
| 2026-10-16 | 373 | 100 | 0/3 | p46 |
| 2026-10-15 | 400 | 100 | 0/3 | p51 |
| 2026-10-14 | 400 | 100 | 0/3 | p51 |
| 2026-10-13 | 400 | 100 | 0/3 | p55 |
| 2026-10-12 | 400 | 100 | 0/3 | p49 |
| 2026-10-11 | 400 | 100 | 1/3 | p32 |
| 2026-10-10 | 400 | 100 | 1/3 | p25 |
| 2026-10-09 | 400 | 100 | 2/3 | p18 |
| 2026-10-08 | 400 | 100 | 3/3 | p21 |
| 2026-10-07 | 400 | 100 | 3/3 | p21 |
Top water assets
- 69Rattlesnake Creekriver
- 69Bannock Creekriver
- 69Midnight Creekriver
- 69Michaud Creekriver
- 69Bannock Creekriver
- 69Sawmill Creekriver
- 69Bannock Creekriver
- 69Rattlesnake Creekriver
- 69Rattlesnake Creekriver
- 69West Fork Bannock Creekriver