Lower San Antonio HUC8 12100303
A 3,846 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
52
Moderate
Drought index
300
Extreme
Area in D2+
100%
0% exceptional (D4)
Gauges below normal
57%
of 7 reporting
Median flow
72%
p25 of record
Water assets
743
15 springs · 250 wells
USGS gauges (7)
- Ecleto Ck nr Runge, TX081865000 cfsp10 · below normal
- Escondido Ck at Kenedy, TX081875000 cfsp10 · below normal
- San Antonio Rv nr Floresville, TX08183200154 cfsp23 · below normal
- San Antonio Rv at Goliad, TX08188500209 cfsp25 · below normal
- San Antonio Rv at SH 72 nr Runge, TX08188060160 cfsp31 · normal
- San Antonio Rv nr Falls City, TX08183500171 cfsp34 · normal
- San Antonio Rv nr McFaddin, TX08188570268 cfsp46 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-19 | 300 | 100 | 4/7 | p25 |
| 2026-10-18 | 300 | 100 | 3/7 | p27 |
| 2026-10-17 | 300 | 100 | 3/7 | p29 |
| 2026-10-16 | 300 | 100 | 2/7 | p43 |
| 2026-10-15 | 300 | 100 | 2/7 | p45 |
| 2026-10-14 | 300 | 100 | 1/7 | p39 |
| 2026-10-13 | 300 | 100 | 1/7 | p39 |
| 2026-10-12 | 300 | 100 | 1/7 | p35 |
| 2026-10-11 | 300 | 100 | 1/7 | p48 |
| 2026-10-10 | 300 | 100 | 1/7 | p54 |
| 2026-10-09 | 300 | 100 | 1/7 | p59 |
| 2026-10-08 | 359 | 100 | 1/7 | p71 |
| 2026-10-07 | 359 | 100 | 1/7 | p92 |
| 2026-10-06 | 359 | 100 | 1/7 | p92 |
Top water assets
- 66Escondido Creek Ws Scs Site 4 Damreservoir
- 66Escondido Creek Ws Scs Site 12 Damreservoir
- 66Ecleto Creek Ws Nrcs Site 3 Damreservoir
- 66Escondido Creek Ws Scs Site 2 Damreservoir
- 66Escondido Creek Ws Scs Site 8 Damreservoir
- 66Escondido Creek Ws Scs Site 3 Damreservoir
- 66Hondo Creek Ws Scs Site 2 Damreservoir
- 66Escondido Creek Ws Scs Site 6 Damreservoir
- 66Escondido Creek Ws Scs Site 13 Damreservoir
- 66Escondido Creek Ws Scs Site 9 Damreservoir