Lower Santa Cruz HUC8 15050303
A 4,358 km² sub-basin of the Lower Colorado region in AZ. 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
50
Moderate
Drought index
258
Severe
Area in D2+
58.44%
0% exceptional (D4)
Gauges below normal
50%
of 2 reporting
Median flow
176%
p47 of record
Water assets
3,134
2 springs · 2,883 wells
USGS gauges (3)
- SANTA CRUZ RIVER NEAR LAVEEN, AZ.094890000 cfsp10 · below normal
- SANTA CRUZ RIVER AT TRICO ROAD, NR MARANA, AZ.0948652074 cfsp84 · above normal
- VEKOL WASH NR STANFIELD094886500 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 258 | 58.44 | 1/2 | p47 |
Top water assets
- 67Santa Cruz Riverriver
- 67Santa Cruz Riverriver
- 67Santa Cruz Riverriver
- 65Santa Rosa Washriver
- 65Vekol Washriver
- 65Santa Cruz Riverriver
- 65Santa Cruz Riverriver
- 65Greene Washriver
- 65Greene Washriver
- 65Tucson Aqueductriver