Santa Maria HUC8 15030203
A 3,711 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
55
Moderate
Drought index
142
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
100%
of 2 reporting
Median flow
—
p10 of record
Water assets
1,273
68 springs · 353 wells
USGS gauges (2)
- LITTLE SYCAMORE WASH NEAR BAGDAD, AZ094246000 cfsp10 · below normal
- SANTA MARIA RIVER NEAR BAGDAD, AZ094249000 cfsp10 · below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 142 | 0 | 2/2 | p10 |
Top water assets
- 67Kirkland Creekriver
- 67Bridle Creekriver
- 67Sycamore Creekriver
- 67Sycamore Creekriver
- 67Date Creekriver
- 67Kirkland Creekriver
- 67Date Creekriver
- 67Date Creekriver
- 67Date Creekriver
- 67Date Creekriver