Lower Willamette HUC8 17090012
A 1,043 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
58
Moderate
Drought index
102
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
71%
of 7 reporting
Median flow
38%
p15 of record
Water assets
901
32 springs · 484 wells
USGS gauges (12)
- WILLAMETTE RIVER AT PORTLAND, OR142117202,000 cfsp3 · much below normal
- KELLEY CREEK AT SE 159TH DRIVE AT PORTLAND, OR142114990 cfsp7 · much below normal
- TRYON CREEK NEAR LAKE OSWEGO, OR142113150 cfsp8 · much below normal
- FAIRVIEW CREEK AT GLISAN ST NEAR GRESHAM, OR142118141 cfsp15 · below normal
- JOHNSON CREEK AT MILWAUKIE, OR1421155015 cfsp19 · below normal
- JOHNSON CREEK AT REGNER ROAD, AT GRESHAM, OR142114001 cfsp26 · normal
- JOHNSON CREEK AT SYCAMORE, OR142115002 cfsp26 · normal
- CRYSTAL SPRINGS CREEK AT BYBEE ST, PORTLAND, OR1421154214 cfsno long-term record
- COLUMBIA SLOUGH AT PORTLAND, OR14211820-311 cfsno long-term record
- BADGER CREEK AT RUGG ROAD NEAR GRESHAM, OR4527371222314000 cfsno long-term record
- SUNSHINE CREEK AT MOUTH NEAR GRESHAM, OR4527551222341000 cfsno long-term record
- N FK JOHNSON CR NR SE ORIENT DR, NR GRESHAM, OR4528071222150010 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-19 | 102 | 0 | 5/7 | p15 |
| 2026-10-18 | 102 | 0 | 5/8 | p19 |
| 2026-10-17 | 102 | 0 | 5/8 | p17 |
| 2026-10-16 | 102 | 0 | 6/8 | p21 |
| 2026-10-15 | 102 | 0 | 5/8 | p21 |
| 2026-10-14 | 102 | 0 | 3/8 | p30 |
| 2026-10-13 | 102 | 0 | 3/8 | p31 |
| 2026-10-12 | 102 | 0 | 3/8 | p32 |
| 2026-10-11 | 102 | 0 | 2/8 | p50 |
| 2026-10-10 | 102 | 0 | 2/8 | p47 |
| 2026-10-09 | 102 | 0 | 2/8 | p30 |
| 2026-10-08 | 102 | 0 | 3/8 | p30 |
| 2026-10-07 | 102 | 0 | 2/7 | p33 |
| 2026-10-06 | 102 | 0 | 4/7 | p24 |
Top water assets
- 76Multnomah Channel — Nursery Usesspring
- 76Multnomah Channel — Nursery Usesspring
- 76Multnomah Channel — Recreationspring
- 76The Narrows — Recreationspring
- 76Multnomah Channel — Nursery Usesspring
- 76Multnomah Channel — Nursery Usesspring
- 76Mount Scott Creek — Power Developmentspring
- 76Kellogg Creek — Irrigationspring
- 76Willamette River — Industrial/Manufacturing Usesspring
- 76Gilbert River — Recreationspring