Willow HUC8 17040205
A 1,792 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
41
Stressed
Drought index
400
Exceptional
Area in D2+
100%
0% exceptional (D4)
Gauges below normal
67%
of 3 reporting
Median flow
77%
p11 of record
Water assets
371
5 springs · 53 wells
USGS gauges (3)
- WILLOW CREEK BL TEX CREEK NR RIRIE ID130579407 cfsp8 · much below normal
- WILLOW CREEK BLW FLOODWAY CHANNEL NR UCON ID1305853079 cfsp11 · below normal
- WILLOW CREEK NR RIRIE ID13058000448 cfsp86 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 400 | 100 | 2/3 | p11 |
Top water assets
- 69Tex Creekriver
- 69Willow Creekriver
- 69Grays Lake Outletriver
- 69Grays Lake Outletriver
- 69Hell Creekriver
- 69Brockman Creekriver
- 69Gravel Creekriver
- 69Bulls Forkriver
- 69Willow Creek Bl Tex Creek Nr Ririe Idriver
- 69Brockman Creekriver