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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
58
Moderate
Drought index
123
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
67%
of 6 reporting
Median flow
80%
p22 of record
Water assets
10,546
698 springs · 8,067 wells
USGS gauges (6)
- TOPPENISH CREEK NEAR FORT SIMCOE, WA1250600014 cfsp12 · below normal
- AHTANUM CREEK AT UNION GAP, WA1250250012 cfsp15 · below normal
- YAKIMA RIVER AT MABTON, WA125089901,580 cfsp20 · below normal
- YAKIMA RIVER AT KIONA, WA125105001,870 cfsp25 · below normal
- YAKIMA RIVER ABOVE AHTANUM CREEK AT UNION GAP, WA125004501,380 cfsp44 · normal
- GRANGER DRAIN AT GRANGER, WA1250545061 cfsp79 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-19 | 123 | 0 | 4/6 | p22 |
| 2026-10-18 | 123 | 0 | 2/6 | p36 |
| 2026-10-17 | 123 | 0 | 2/6 | p36 |
| 2026-10-16 | 123 | 0 | 2/6 | p32 |
| 2026-10-15 | 123 | 0 | 2/6 | p38 |
| 2026-10-14 | 123 | 0 | 3/6 | p31 |
| 2026-10-13 | 123 | 0 | 4/6 | p19 |
| 2026-10-12 | 123 | 0 | 4/6 | p16 |
| 2026-10-11 | 123 | 0 | 5/6 | p16 |
| 2026-10-10 | 123 | 0 | 5/6 | p13 |
| 2026-10-09 | 123 | 0 | 5/6 | p10 |
| 2026-10-08 | 123 | 0 | 5/6 | p10 |
| 2026-10-07 | 123 | 0 | 5/6 | p10 |
| 2026-10-06 | 123 | 0 | 5/6 | p10 |
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