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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
60
Moderate
Drought index
117
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
50%
of 2 reporting
Median flow
—
p55 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, AZ0942490075 cfsp100 · much above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 117 | 0 | 1/2 | p55 |
| 2026-10-20 | 117 | 0 | 1/2 | p55 |
| 2026-10-19 | 117 | 0 | 1/2 | p55 |
| 2026-10-18 | 117 | 0 | 1/2 | p55 |
| 2026-10-17 | 117 | 0 | 1/2 | p55 |
| 2026-10-16 | 117 | 0 | 1/2 | p55 |
| 2026-10-15 | 141 | 0 | 1/2 | p55 |
| 2026-10-14 | 141 | 0 | 0/2 | p100 |
| 2026-10-13 | 141 | 0 | 0/2 | p100 |
| 2026-10-12 | 141 | 0 | 1/2 | p55 |
| 2026-10-11 | 141 | 0 | 2/2 | p10 |
| 2026-10-10 | 141 | 0 | 2/2 | p10 |
| 2026-10-09 | 141 | 0 | 2/2 | p10 |
| 2026-10-08 | 142 | 0.07 | 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