Duwamish HUC8 17110013
A 1,258 km² sub-basin of the Pacific Northwest region in WA. 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
100
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
63%
of 8 reporting
Median flow
68%
p15 of record
Water assets
2,834
189 springs · 2,184 wells
USGS gauges (13)
- MILL CREEK NEAR MOUTH AT ORILLIA, WA121133490 cfsp2 · much below normal
- SPRINGBROOK CREEK AT ORILLIA, WA121133462 cfsp8 · much below normal
- MILL CREEK AT EARTHWORKS PARK AT KENT, WA121133471 cfsp10 · much below normal
- GREEN RIVER AT 200TH STREET AT KENT, WA12113344377 cfsp14 · below normal
- BIG SOOS CREEK ABOVE HATCHERY NEAR AUBURN, WA1211260029 cfsp16 · below normal
- GREEN RIVER AT PURIFICATION PLANT NEAR PALMER, WA12106700305 cfsp39 · normal
- GREEN RIVER BELOW HOWARD A HANSON DAM, WA12105900400 cfsp42 · normal
- GREEN RIVER NEAR AUBURN, WA12113000455 cfsp42 · normal
- NEWAUKUM CREEK NEAR BLACK DIAMOND, WA12108500no readingno long-term record
- GREEN RIVER BELOW CRISP CREEK NR BLACK DIAMOND, WA12108800346 cfsno long-term record
- GREEN RIVER ABOVE S 277TH ST AT KENT, WA12113150460 cfsno long-term record
- GREEN RIVER BELOW MEEKER ST AT KENT, WA12113310432 cfsno long-term record
- DUWAMISH RIVER AT GOLF COURSE AT TUKWILA, WA12113390452 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-19 | 100 | 0 | 5/8 | p15 |
| 2026-10-18 | 100 | 0 | 5/8 | p20 |
| 2026-10-17 | 100 | 0 | 5/8 | p19 |
| 2026-10-16 | 100 | 0 | 5/8 | p20 |
| 2026-10-15 | 100 | 0 | 5/8 | p19 |
| 2026-10-14 | 100 | 0 | 3/7 | p28 |
| 2026-10-13 | 100 | 0 | 4/8 | p21 |
| 2026-10-12 | 100 | 0 | 4/8 | p25 |
| 2026-10-11 | 100 | 0 | 3/8 | p41 |
| 2026-10-10 | 100 | 0 | 4/8 | p27 |
| 2026-10-09 | 100 | 0 | 4/8 | p29 |
| 2026-10-08 | 100 | 0 | 5/9 | p24 |
| 2026-10-07 | 100 | 0 | 5/9 | p22 |
| 2026-10-06 | 100 | 0 | 4/9 | p29 |
Top water assets
- 76Fs — Ce S1-22503Cwrisspring
- 76Fs — Ce S1-21122Cwrisspring
- 76Mi — Ce S1-*20279Cwrisspring
- 76Fs — Cl S1-000449Clspring
- 76Fs — Ce S1-*19055Cwrisspring
- 76Puget Sound Aquifer System — South King Countyaquifer
- 76Mu — Ce S1-00506Cspring
- 76Fs — Ch Cs1-22503Cwrisspring
- 73Fs — Ce S1-*07990Cwrisspring
- 73Fs Re — Ce S1-*08048Cwrisspring