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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
62
Moderate
Drought index
177
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 2 reporting
Median flow
614%
p66 of record
Water assets
35
16 springs · 10 wells
USGS gauges (2)
- Rio Grande nr Castolon, TX08374550298 cfsp36 · normal
- Rio Grande at Rio Grande Village, Big Bnd NP, TX083753007,340 cfsp97 · much above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-19 | 177 | 0 | 0/2 | p66 |
| 2026-10-18 | 177 | 0 | 0/2 | p77 |
| 2026-10-17 | 177 | 0 | 0/2 | p84 |
| 2026-10-16 | 177 | 0 | 0/1 | p58 |
| 2026-10-15 | 177 | 0 | 1/2 | p45 |
| 2026-10-14 | 177 | 0 | 2/2 | p9 |
| 2026-10-13 | 177 | 0 | 2/2 | p7 |
| 2026-10-12 | 177 | 0 | 2/2 | p8 |
| 2026-10-11 | 177 | 0 | 2/2 | p9 |
| 2026-10-10 | 177 | 0 | 2/2 | p5 |
| 2026-10-09 | 177 | 0 | 1/1 | p5 |
| 2026-10-08 | 237 | 37.38 | 1/1 | p5 |
| 2026-10-07 | 237 | 37.38 | 1/1 | p5 |
| 2026-10-06 | 237 | 37.38 | 1/2 | p36 |
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