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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
53
Moderate
Drought index
365
Extreme
Area in D2+
100%
0% exceptional (D4)
Gauges below normal
20%
of 5 reporting
Median flow
56%
p28 of record
Water assets
132
25 springs · 53 wells
USGS gauges (5)
- ROW RIVER NEAR COTTAGE GROVE, OR14155500107 cfsp24 · below normal
- COAST FORK WILLAMETTE R BLW COTTAGE GROVE DAM, OR1415350053 cfsp26 · normal
- COAST FORK WILLAMETTE RIVER NEAR GOSHEN, OR14157500198 cfsp28 · normal
- COAST FORK WILLAMETTE AT LONDON, OR1415250025 cfsp80 · above normal
- ROW RIVER ABOVE PITCHER CREEK, NEAR DORENA, OR1415450061 cfsp86 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 365 | 100 | 1/5 | p28 |
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