Upper San Antonio HUC8 12100301
A 1,313 km² sub-basin of the Texas-Gulf region in TX. 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
67
Moderate
Drought index
131
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
38%
of 8 reporting
Median flow
68%
p32 of record
Water assets
922
42 springs · 662 wells
USGS gauges (11)
- Olmos Ck at Dresden Dr, San Antonio, TX081777000 cfsp10 · below normal
- Salado Ck at Blanco Rd, San Antonio, TX081785930 cfsp10 · below normal
- San Antonio Rv at Loop 410, San Antonio, TX0817856511 cfsp14 · below normal
- San Antonio Rv nr Elmendorf, TX08181800153 cfsp28 · normal
- San Antonio Rv at Mitchell St, San Antonio, TX0817805014 cfsp36 · normal
- San Pedro Ck at Furnish St, San Antonio, TX081785006 cfsp37 · normal
- San Antonio Rv at San Antonio, TX0817800023 cfsp47 · normal
- Salado Ck at Loop 13, San Antonio, TX0817880011 cfsp47 · normal
- San Antonio Spgs at San Antonio, TX081778180 cfsno long-term record
- Salado Ck at Loop 410, San Antonio, TX081787000 cfsno long-term record
- San Antonio Rv nr Braunig Lk nr Elmendorf, TX08181725274 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 131 | 0 | 3/8 | p32 |
Top water assets
- 66Salado Creek Ws Scs Site 6 Damreservoir
- 66Salado Creek Ws Scs Site 13B Damreservoir
- 66Salado Creek Ws Scs Site 7 Damreservoir
- 66Salado Creek Ws Scs Site 5 Damreservoir
- 66Calaveras Creek Damreservoir
- 66Salado Creek Ws Scs Site 1 Damreservoir
- 66Salado Creek Ws Scs Site 9 Damreservoir
- 66Salado Creek Ws Scs Site 10 Damreservoir
- 66Calaveras Creek Ws Scs Site 7 Damreservoir
- 66Olmos Damreservoir