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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
58
Moderate
Drought index
305
Extreme
Area in D2+
100%
0% exceptional (D4)
Gauges below normal
0%
of 5 reporting
Median flow
144%
p82 of record
Water assets
4,128
1,935 springs · 1,319 wells
USGS gauges (7)
- BLUE CREEK NEAR WALLA WALLA, WA140135001 cfsp39 · normal
- MILL CREEK NEAR WALLA WALLA, WA1401300040 cfsp78 · above normal
- MILL CREEK AT FIVE MILE RD BR NR WALLA WALLA, WA1401370037 cfsp82 · above normal
- WALLA WALLA RIVER NEAR TOUCHET, WA1401850067 cfsp85 · above normal
- MILL CREEK AT WALLA WALLA, WA1401500016 cfsp92 · much above normal
- MILL CR AT LAST CHANCE RD BR NR COLLEGE PLACE, WA1401535024 cfsno long-term record
- TOUCHET RIVER AT GALLAHER RD NEAR WAITSBURG, WA1401682038 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 305 | 100 | 0/5 | p82 |
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