Big Bend HUC8 13040205
A 15,501 km² sub-basin of the Rio Grande region in MX, 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
35
Stressed
Drought index
224
Severe
Area in D2+
23.57%
0% exceptional (D4)
Gauges below normal
100%
of 2 reporting
Median flow
4%
p3 of record
Water assets
35
16 springs · 10 wells
USGS gauges (2)
- Rio Grande nr Castolon, TX0837455012 cfsp2 · much below normal
- Rio Grande at Rio Grande Village, Big Bnd NP, TX0837530028 cfsp4 · much below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 224 | 23.57 | 2/2 | p3 |
Top water assets
- 67Rio Grande Nr Castolon, Txriver
- 65Rio Grande At Rio Grande Village, Big Bnd Np, Txriver
- 51Texas Water Right 62300989201well
- 51Texas Water Right 62300989101well
- 51Texas Water Right 62300987002well
- 51Texas Water Right 62300988001well
- 48Bk-73-47-504well
- 47Bk-73-52-905well
- 45Bk-73-52-906well
- 44Rio Grande Dws Santa Elena Canyon, Bbnp, Txriver