Walla Walla HUC8 17070102
A 4,601 km² sub-basin of the Pacific Northwest region in OR, 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
54
Moderate
Drought index
285
Severe
Area in D2+
80.72%
0% exceptional (D4)
Gauges below normal
40%
of 5 reporting
Median flow
94%
p41 of record
Water assets
4,128
1,935 springs · 1,319 wells
USGS gauges (7)
- MILL CREEK AT FIVE MILE RD BR NR WALLA WALLA, WA1401370027 cfsp10 · much below normal
- WALLA WALLA RIVER NEAR TOUCHET, WA1401850032 cfsp22 · below normal
- BLUE CREEK NEAR WALLA WALLA, WA140135001 cfsp41 · normal
- MILL CREEK NEAR WALLA WALLA, WA1401300032 cfsp45 · normal
- MILL CREEK AT WALLA WALLA, WA1401500013 cfsp83 · above normal
- MILL CR AT LAST CHANCE RD BR NR COLLEGE PLACE, WA1401535016 cfsno long-term record
- TOUCHET RIVER AT GALLAHER RD NEAR WAITSBURG, WA1401682043 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-18 | 285 | 80.72 | 2/5 | p41 |
| 2026-10-17 | 285 | 80.72 | 2/5 | p41 |
| 2026-10-16 | 285 | 80.72 | 2/5 | p41 |
| 2026-10-15 | 285 | 80.72 | 1/5 | p30 |
| 2026-10-14 | 285 | 80.72 | 1/5 | p45 |
| 2026-10-13 | 285 | 80.72 | 1/5 | p44 |
| 2026-10-12 | 285 | 80.72 | 1/5 | p42 |
| 2026-10-11 | 285 | 80.72 | 2/5 | p39 |
| 2026-10-10 | 285 | 80.72 | 2/5 | p39 |
| 2026-10-09 | 285 | 80.72 | 3/5 | p24 |
| 2026-10-08 | 285 | 80.72 | 3/5 | p24 |
| 2026-10-07 | 285 | 80.72 | 2/5 | p29 |
| 2026-10-06 | 285 | 80.72 | 3/5 | p22 |
| 2026-10-05 | 285 | 80.72 | 3/5 | p23 |
Top water assets
- 76Ds Ir St — Ce S3-28621Jcspring
- 76Ir — Ce S3-*34262Jspring
- 76Ir — Ce S3-*20723Alcwrisspring
- 76Ir — Ce S3-28849Jcspring
- 76Ir — Ce S3-01599Cwrisspring
- 76Ds Ir St — Ce S3-28117Jcspring
- 76Ir — Ce S3-34214Jcspring
- 76West Prong Little Walla Walla River — Power Developmentspring
- 76Ir — Ce S3-*18785Cspring
- 76Ci — Cc S3-Cv2P517spring