Upper Willamette HUC8 17090003
A 4,849 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
59
Moderate
Drought index
282
Severe
Area in D2+
81.63%
0% exceptional (D4)
Gauges below normal
11%
of 9 reporting
Median flow
176%
p77 of record
Water assets
1,932
30 springs · 1,661 wells
USGS gauges (10)
- WILLAMETTE RIVER AT HARRISBURG, OR141660004,120 cfsp21 · below normal
- WILLAMETTE RIVER AT CORVALLIS, OR141716004,650 cfsp33 · normal
- WILLAMETTE RIVER AT ALBANY, OR141740004,770 cfsp52 · normal
- CALAPOOIA RIVER AT ALBANY, OR1417350053 cfsp75 · above normal
- LONG TOM RIVER NEAR ALVADORE, OR1416900069 cfsp77 · above normal
- LONG TOM RIVER NEAR NOTI, OR1416650030 cfsp85 · above normal
- LONG TOM RIVER AT MONROE, OR1417000096 cfsp85 · above normal
- LUCKIAMUTE RIVER NEAR SUVER, OR1419050094 cfsp86 · above normal
- MARYS RIVER NEAR PHILOMATH, OR1417100047 cfsp90 · above normal
- LUCKIAMUTE RIVER NEAR BUENA VISTA, OR1419061093 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 282 | 81.63 | 1/9 | p77 |
Top water assets
- 76Calapooia River — Irrigationspring
- 76A Well — Irrigationwell
- 76Well 3 — Irrigationwell
- 76Calapooia River — Irrigationspring
- 76Calapooia River — Irrigationspring
- 76A Well — Irrigationwell
- 76Calapooia River — Irrigationspring
- 76Well 2 — Irrigationwell
- 76A Well — Irrigationwell
- 76A Well — Irrigationwell