Illinois HUC8 17100311
A 2,564 km² sub-basin of the Pacific Northwest region in CA, OR. 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
43
Stressed
Drought index
199
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
100%
of 3 reporting
Median flow
55%
p10 of record
Water assets
165
58 springs · 79 wells
USGS gauges (3)
- ILLINOIS RIVER NEAR AGNESS, OR14378200158 cfsp9 · much below normal
- ILLINOIS RIVER NEAR KERBY, OR1437710032 cfsp10 · much below normal
- SUCKER CREEK BLW LITTLE GRAYBACK CK, NR HOLLAND,OR1437510019 cfsp10 · below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 199 | 0 | 3/3 | p10 |
| 2026-10-19 | 199 | 0 | 3/3 | p10 |
| 2026-10-18 | 199 | 0 | 3/3 | p10 |
| 2026-10-17 | 199 | 0 | 3/3 | p11 |
| 2026-10-16 | 199 | 0 | 3/3 | p11 |
| 2026-10-15 | 199 | 0 | 3/3 | p12 |
| 2026-10-14 | 199 | 0 | 3/3 | p13 |
| 2026-10-13 | 199 | 0 | 3/3 | p12 |
| 2026-10-12 | 199 | 0 | 3/3 | p14 |
| 2026-10-11 | 199 | 0 | 3/3 | p12 |
| 2026-10-10 | 199 | 0 | 3/3 | p12 |
| 2026-10-09 | 199 | 0 | 3/3 | p15 |
| 2026-10-08 | 199 | 0 | 3/3 | p15 |
| 2026-10-07 | 199 | 0 | 3/3 | p18 |
Top water assets
- 76Hydraulic Gulch — Miningspring
- 76Run Gulch — Miningspring
- 76South Fork Of Althouse Creek — Miningspring
- 76Althouse Creek — Miningspring
- 76Althouse Creek — Miningspring
- 76Sucker Creek — Miningspring
- 76Browntown Gulch — Miningspring
- 76Althouse Creek — Miningspring
- 76Democrat Gulch — Miningspring
- 76Run Gulch — Miningspring