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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
67
Moderate
Drought index
102
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 8 reporting
Median flow
813%
p94 of record
Water assets
901
32 springs · 484 wells
USGS gauges (12)
- JOHNSON CREEK AT MILWAUKIE, OR1421155030 cfsp82 · above normal
- FAIRVIEW CREEK AT GLISAN ST NEAR GRESHAM, OR142118144 cfsp84 · above normal
- WILLAMETTE RIVER AT PORTLAND, OR1421172022,700 cfsp89 · above normal
- COLUMBIA SLOUGH AT PORTLAND, OR14211820355 cfsp92 · much above normal
- TRYON CREEK NEAR LAKE OSWEGO, OR142113157 cfsp96 · much above normal
- JOHNSON CREEK AT SYCAMORE, OR1421150021 cfsp97 · much above normal
- JOHNSON CREEK AT REGNER ROAD, AT GRESHAM, OR1421140016 cfsp97 · much above normal
- KELLEY CREEK AT SE 159TH DRIVE AT PORTLAND, OR142114994 cfsp98 · much above normal
- CRYSTAL SPRINGS CREEK AT BYBEE ST, PORTLAND, OR1421154215 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 |
|---|---|---|---|---|
| 2026-09-07 | 102 | 0 | 0/8 | p94 |
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