Middle Columbia-Lake Wallula HUC8 17070101
A 6,645 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
61
Moderate
Drought index
149
Moderate
Area in D2+
6.3%
0% exceptional (D4)
Gauges below normal
—
no gauges reporting
Median flow
—
of normal for the date
Water assets
1,936
781 springs · 849 wells
USGS gauges (0)
No active discharge gauges in this sub-basin.
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 149 | 6.3 | — | — |
Top water assets
- 78St — Cl S4-004402Clspring
- 78St — Cl S4-112730Clspring
- 76St — Cl S4-095285Clspring
- 76St — Cl S4-110225Clspring
- 76St — Cl S4-301061Clspring
- 76Runoff — Supplemental Irrigationspring
- 76St — Cl S4-152217Clspring
- 76St — Cl S4-121226Clspring
- 76Dg St — Cl S4-131306Clspring
- 76Fr He — Ce S4-24238Cspring