Coast Fork Willamette HUC8 17090002
A 1,726 km² sub-basin of the Pacific Northwest region in 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
50
Moderate
Drought index
310
Extreme
Area in D2+
100%
0% exceptional (D4)
Gauges below normal
40%
of 5 reporting
Median flow
49%
p26 of record
Water assets
132
25 springs · 53 wells
USGS gauges (5)
- COAST FORK WILLAMETTE AT LONDON, OR141525009 cfsp7 · much below normal
- ROW RIVER ABOVE PITCHER CREEK, NEAR DORENA, OR1415450018 cfsp9 · much below normal
- COAST FORK WILLAMETTE R BLW COTTAGE GROVE DAM, OR14153500113 cfsp26 · normal
- COAST FORK WILLAMETTE RIVER NEAR GOSHEN, OR14157500719 cfsp44 · normal
- ROW RIVER NEAR COTTAGE GROVE, OR14155500553 cfsp52 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-19 | 310 | 100 | 2/5 | p26 |
| 2026-10-18 | 310 | 100 | 2/5 | p28 |
| 2026-10-17 | 310 | 100 | 2/5 | p28 |
| 2026-10-16 | 310 | 100 | 2/5 | p34 |
| 2026-10-15 | 310 | 100 | 2/5 | p36 |
| 2026-10-14 | 310 | 100 | 2/5 | p38 |
| 2026-10-13 | 310 | 100 | 2/5 | p36 |
| 2026-10-12 | 310 | 100 | 2/5 | p37 |
| 2026-10-11 | 310 | 100 | 2/5 | p38 |
| 2026-10-10 | 310 | 100 | 2/5 | p40 |
| 2026-10-09 | 310 | 100 | 2/5 | p38 |
| 2026-10-08 | 310 | 100 | 2/5 | p38 |
| 2026-10-07 | 310 | 100 | 2/5 | p38 |
| 2026-10-06 | 310 | 100 | 2/5 | p38 |
Top water assets
- 73A Well — Irrigationwell
- 67Herman Creekriver
- 67Saltpeter Creekriver
- 67East Fork Layng Creekriver
- 67Dorena Damreservoir
- 67Silverstairs Creekriver
- 67Layng Creekriver
- 66Mosby Creek — Irrigationspring
- 66A Well — Irrigationwell
- 66A Sump — Irrigationwell