Grand Wash HUC8 15010006
A 2,420 km² sub-basin of the Lower Colorado region in AZ, NV. 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
51
Moderate
Drought index
279
Severe
Area in D2+
79.01%
0% exceptional (D4)
Gauges below normal
—
no gauges reporting
Median flow
—
of normal for the date
Water assets
349
31 springs · 14 wells
USGS gauges (0)
No active discharge gauges in this sub-basin.
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 279 | 79.01 | — | — |
Top water assets
- 67Grand Washriver
- 67Cottonwood Washriver
- 67Cottonwood Washriver
- 67Grand Washriver
- 67Grand Washriver
- 67Grand Washriver
- 67Cottonwood Washriver
- 67Cottonwood Washriver
- 67Cottonwood Washriver
- 67Grand Washriver