Southern Puerto Rico HUC8 21010004
A 3,494 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
53
Moderate
Drought index
291
Severe
Area in D2+
76.73%
0% exceptional (D4)
Gauges below normal
43%
of 35 reporting
Median flow
94%
p45 of record
Water assets
13
2 springs · 0 wells
USGS gauges (38)
- RIO GRANDE DE PATILLAS BLW LAGO PATILLAS, PR500931200 cfsp0 · much below normal
- RIO LOCO AT LAS LATAS NR LA JOYA NR GUANICA, PR501292540 cfsp0 · much below normal
- RIO PORTUGUES AT PARQUE CEREMONIAL TIBES NR PONCE501152402 cfsp3 · much below normal
- RIO CERRILLOS ABV LAGO CERRILLOS NR PONCE, PR5011380013 cfsp6 · much below normal
- RIO JACAGUAS ABV LAGO GUAYABAL5011065024 cfsp6 · much below normal
- RIO GRANDE DE PATILLAS NR PATILLAS, PR5009200010 cfsp6 · much below normal
- RIO PORTUGUES NR TIBES, PR501149007 cfsp6 · much below normal
- RIO LAPA NR RABO DEL BUEY, PR501002000 cfsp6 · much below normal
- RIO INABON AT REAL ABAJO, PR501125009 cfsp7 · much below normal
- RIO GUAYANILLA NEAR GUAYANILLA, PR5012420010 cfsp11 · below normal
- CANAL DE RIEGO DE LAJAS AT BO. PALMAREJO NR LAJAS501289453 cfsp11 · below normal
- CANAL DE JUANA DIAZ AT BO. PENUELAS NR SALINAS, PR501113402 cfsp14 · below normal
- CANAL DE JUANA DIAZ AT PASO SECO NR SANTA ISABEL501113305 cfsp17 · below normal
- RIO CERRILLOS BLW LAGO CERRILLOS NR PONCE, PR501140004 cfsp18 · below normal
- RIO COAMO AT HWY 14 AT COAMO, PR5010610017 cfsp25 · below normal
- RIO JACAGUAS AT JUANA DIAZ, PR5011150044 cfsp26 · normal
- CANAL DE PATILLAS BLW GUAYAMA FILTRATION PLANT, PR500930789 cfsp43 · normal
- CANAL DE RIEGO DE LAJAS BLW LAJAS FILT PLANT LAJAS501289408 cfsp45 · normal
- CANAL DE PATILLAS ABV EL LEGADO INTAKE, PR500930907 cfsp49 · normal
- CANAL DE PATILLAS ABV AES INTAKE AT GUAYAMA, PR5009308310 cfsp50 · normal
- CANAL RIEGO DE LAJAS ABV LAJAS FILTRATION PLANT5012893316 cfsp57 · normal
- RIO MAJADA AT LA PLENA, PR5010045011 cfsp60 · normal
- CANAL DE GUAMANI OESTE AT HWY 15 GUAYAMA, PR500950006 cfsp73 · normal
- CANAL DE JUANA DIAZ AT PIEDRA AGUZADA NR JUANA DIA5011132019 cfsp75 · above normal
- CANAL DE PATILLAS AT FOREBAY, PR5009305323 cfsp76 · above normal
- RIO YAUCO ABV DIVERSION MONSERRATE NR YAUCO, PR5012615044 cfsp79 · above normal
- RIO MARIN NR PATILLAS, PR5009300021 cfsp79 · above normal
- CANAL DE PATILLAS ABV GUAYAMA FILTRATION PLANT, PR5009307525 cfsp79 · above normal
- CANAL DE RIEGO DE LAJAS BLW MAJINAS FILT. PLANT PR5012892532 cfsp81 · above normal
- LATERAL M5L, CANAL DE RIEGO DE LAJAS SABANA GRANDE501289071 cfsp82 · above normal
- CANAL DE RIEGO DE LAJAS ABV MAJINAS FILT. PLANT PR5012892038 cfsp83 · above normal
- CANAL DE RIEGO DE LAJAS BLW LAGO LOCO DAM YAUCO PR5012890543 cfsp83 · above normal
- CANAL DE PATILLAS AT INTAKE 123, SALINAS PR500931155 cfsp87 · above normal
- RIO TOA VACA ABV LAGO TOA VACA, PR50110900127 cfsp88 · above normal
- CANAL DE PATILLAS AT INTAKE 113 SALINAS, PR500931105 cfsp90 · above normal
- CANAL DE JUANA DIAZ AT LAGO GUAYABAL, PR18045506630170121 cfsno long-term record
- RIO ARROYATA AT HWY 7774 NR CIDRA, PR500439503 cfsno long-term record
- RIO COAMO NR COAMO, PR50106500101 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 291 | 76.73 | 15/35 | p45 |
| 2026-10-19 | 291 | 76.73 | 13/35 | p52 |
| 2026-10-18 | 291 | 76.73 | 14/35 | p45 |
| 2026-10-17 | 291 | 76.73 | 16/35 | p31 |
| 2026-10-16 | 291 | 76.73 | 14/35 | p44 |
| 2026-10-15 | 302 | 76.73 | 13/35 | p32 |
| 2026-10-14 | 302 | 76.73 | 13/35 | p40 |
| 2026-10-13 | 302 | 76.73 | 13/35 | p36 |
| 2026-10-12 | 302 | 76.73 | 10/35 | p50 |
| 2026-10-11 | 302 | 76.73 | 12/35 | p41 |
| 2026-10-10 | 302 | 76.73 | 14/35 | p48 |
| 2026-10-09 | 302 | 76.73 | 14/35 | p54 |
| 2026-10-08 | 302 | 76.73 | 11/34 | p60 |
| 2026-10-07 | 302 | 76.73 | 13/34 | p43 |
Top water assets
- 67Portugues Damreservoir
- 67Toa Vaca Damreservoir
- 67Guayabal Damreservoir
- 67Patillas Damreservoir
- 67Lucchetti Damreservoir
- 67Cerrillos Damreservoir
- 66Ana Mariaâ Ii Damreservoir
- 66Ana Mariaâ V Damreservoir
- 66Coamo Damreservoir
- 66Loco Damreservoir