Culebrinas-Guanajibo HUC8 21010003
A 1,661 km² sub-basin of the Caribbean region in PR. 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
69
Moderate
Drought index
23
Abnormally dry
Area in D2+
1.31%
0% exceptional (D4)
Gauges below normal
60%
of 5 reporting
Median flow
63%
p23 of record
Water assets
7
2 springs · 0 wells
USGS gauges (7)
- RIO GUANAJIBO NR HORMIGUEROS, PR5013800057 cfsp6 · much below normal
- CANAL DE RIEGO DE LAJAS AT BO. BETANCES, PR501289483 cfsp19 · below normal
- RIO ROSARIO NR HORMIGUEROS, PR5013640063 cfsp23 · below normal
- RIO GRANDE DE ANASCO NR SAN SEBASTIAN, PR50144000432 cfsp29 · normal
- RIO CULEBRINAS AT HWY 404 NR MOCA, PR50147800597 cfsp81 · above normal
- RIO GUAJATACA ABV LAGO DE GUAJATACA, PR5001060034 cfsno long-term record
- RIO CULEBRINAS AT MARGARITA DAMSITE NR AGUADA, PR50148890no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 23 | 1.31 | 3/5 | p23 |
| 2026-10-19 | 23 | 1.31 | 1/5 | p69 |
| 2026-10-18 | 23 | 1.31 | 3/5 | p21 |
| 2026-10-17 | 23 | 1.31 | 4/5 | p20 |
| 2026-10-16 | 23 | 1.31 | 2/5 | p26 |
| 2026-10-15 | 23 | 1.31 | 3/5 | p24 |
| 2026-10-14 | 23 | 1.31 | 5/5 | p8 |
| 2026-10-13 | 23 | 1.31 | 3/5 | p21 |
| 2026-10-12 | 23 | 1.31 | 4/5 | p10 |
| 2026-10-11 | 23 | 1.31 | 4/5 | p16 |
| 2026-10-10 | 23 | 1.31 | 1/5 | p27 |
| 2026-10-09 | 23 | 1.31 | 3/5 | p17 |
| 2026-10-08 | 27 | 1.22 | 3/5 | p21 |
| 2026-10-07 | 27 | 1.22 | 0/5 | p40 |
Top water assets
- 67Guayo Damreservoir
- 66Yahuecas Damreservoir
- 66Daguey Dam Structure 3reservoir
- 66Prieto Damreservoir
- 66Ajies Dam Structure 2Areservoir
- 39Yeni’s Springspring
- 39Yeni’s Springspring