Lower Yakima HUC8 17030003
A 7,528 km² sub-basin of the Pacific Northwest region in WA. 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
62
Moderate
Drought index
172
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
17%
of 6 reporting
Median flow
132%
p78 of record
Water assets
10,546
698 springs · 8,067 wells
USGS gauges (6)
- YAKIMA RIVER ABOVE AHTANUM CREEK AT UNION GAP, WA125004502,390 cfsp19 · below normal
- YAKIMA RIVER AT KIONA, WA125105002,080 cfsp76 · above normal
- YAKIMA RIVER AT MABTON, WA125089902,060 cfsp78 · above normal
- GRANGER DRAIN AT GRANGER, WA1250545067 cfsp79 · above normal
- TOPPENISH CREEK NEAR FORT SIMCOE, WA1250600021 cfsp80 · above normal
- AHTANUM CREEK AT UNION GAP, WA1250250029 cfsp81 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 172 | 0 | 1/6 | p78 |
Top water assets
- 76Fs — Ap S4-30971spring
- 76Fs — Ap S4-30965spring
- 76St — Cl S4-067060Clspring
- 76St — Cl S4-085881Clspring
- 76Ir St — Ap S4-32720spring
- 76Ir Wl — Ap S4-28246spring
- 76Wl — Ap S4-32902spring
- 76Ir — Pe S4-30728Pspring
- 76St — Cl S4-085970Clspring
- 76Fs — Ap S4-30962spring