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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
56
Moderate
Drought index
234
Severe
Area in D2+
45.79%
0% exceptional (D4)
Gauges below normal
50%
of 8 reporting
Median flow
65%
p24 of record
Water assets
922
42 springs · 662 wells
USGS gauges (11)
- San Pedro Ck at Furnish St, San Antonio, TX081785000 cfsp0 · much below normal
- 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 nr Elmendorf, TX08181800138 cfsp16 · below normal
- San Antonio Rv at Loop 410, San Antonio, TX0817856516 cfsp32 · normal
- Salado Ck at Loop 13, San Antonio, TX0817880011 cfsp40 · normal
- San Antonio Rv at Mitchell St, San Antonio, TX0817805015 cfsp40 · normal
- San Antonio Rv at San Antonio, TX0817800025 cfsp50 · 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 |
|---|---|---|---|---|
| 2026-10-19 | 234 | 45.79 | 4/8 | p24 |
| 2026-10-18 | 234 | 45.79 | 4/8 | p24 |
| 2026-10-17 | 234 | 45.79 | 4/8 | p20 |
| 2026-10-16 | 234 | 45.79 | 4/8 | p21 |
| 2026-10-15 | 234 | 45.79 | 4/8 | p30 |
| 2026-10-14 | 234 | 45.79 | 3/8 | p32 |
| 2026-10-13 | 234 | 45.79 | 3/8 | p35 |
| 2026-10-12 | 234 | 45.79 | 4/8 | p25 |
| 2026-10-11 | 234 | 45.79 | 4/8 | p24 |
| 2026-10-10 | 234 | 45.79 | 4/8 | p27 |
| 2026-10-09 | 234 | 45.79 | 4/8 | p28 |
| 2026-10-08 | 246 | 45.79 | 2/8 | p43 |
| 2026-10-07 | 246 | 45.79 | 2/8 | p55 |
| 2026-10-06 | 246 | 45.79 | 2/8 | p54 |
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