Eastern Puerto Rico HUC8 21010005
A 3,701 km² sub-basin of the Caribbean region in PR. 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
40
Stressed
Drought index
349
Extreme
Area in D2+
93.74%
0% exceptional (D4)
Gauges below normal
77%
of 35 reporting
Median flow
30%
p8 of record
Water assets
11
2 springs · 0 wells
USGS gauges (39)
- RIO GRANDE DE LOIZA BLW LOIZA DAMSITE, PR500590500 cfsp0 · much below normal
- RIO VALENCIANO NR JUNCOS, PR500564002 cfsp2 · much below normal
- QUEBRADA GRANDE AT BO. DOS BOCAS, PR500592102 cfsp3 · much below normal
- RIO GURABO AT GURABO, PR500570006 cfsp3 · much below normal
- RIO MAUNABO AT LIZAS, PR500905002 cfsp4 · much below normal
- RIO DE BAYAMON BLW LAGO DE CIDRA DAM, PR500475601 cfsp5 · much below normal
- RIO TURABO ABV BORINQUEN, PR500530254 cfsp6 · much below normal
- RIO GURABO BLW EL MANGO, PR500557503 cfsp6 · much below normal
- RIO CAGUITAS AT VILLA BLANCA AT CAGUAS, PR500552256 cfsp6 · much below normal
- RIO GRANDE DE LOIZA AT CAGUAS, PR5005500030 cfsp6 · much below normal
- RIO DE LA PLATA AT COMERIO, PR5004380017 cfsp6 · much below normal
- RIO DE BAYAMON NR BAYAMON, PR500478504 cfsp6 · much below normal
- RIO CANAS AT RIO CANAS, PR500583502 cfsp7 · much below normal
- QDA. MARGARITA AT CAPARRA INTER. NR GUAYNABO, PR500496202 cfsp7 · much below normal
- RIO CAYAGUAS AT CERRO GORDO, PR5005131010 cfsp7 · much below normal
- RIO GRANDE DE LOIZA AT HWY 183 SAN LORENZO, PR5005180022 cfsp7 · much below normal
- RIO CANOVANAS NR CAMPO RICO, PR500618005 cfsp8 · much below normal
- RIO BAIROA ABV BAIROA, CAGUAS, PR500553802 cfsp8 · much below normal
- RIO PIEDRAS AT HATO REY, PR5004910014 cfsp9 · much below normal
- RIO GUADIANA NR GUADIANA, NARANJITO PR500448104 cfsp10 · much below normal
- RIO HUMACAO AT LAS PIEDRAS, PR500810007 cfsp10 · below normal
- RIO DE LA PLATA BLW LA PLATA DAMSITE, PR500450100 cfsp11 · below normal
- QUEBRADA JOSEFINA AT PINERO AVENUE, PR500493103 cfsp13 · below normal
- RIO USABON AT HWY 162 NR BARRANQUITAS, PR500431972 cfsp13 · below normal
- RIO DE LA PLATA AT HWY 2 NR TOA ALTA, PR5004600033 cfsp18 · below normal
- RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR5005090010 cfsp18 · below normal
- RIO GUAYANES NR YABUCOA, PR5008350030 cfsp22 · below normal
- RIO DE LA PLATA AT PROYECTO LA PLATA, PR5004300020 cfsp29 · normal
- RIO DE BAYAMON AT ARENAS, PR500475350 cfsp39 · normal
- RIO FAJARDO AT PARAISO NR FAJARDO, PR5007090058 cfsp55 · normal
- RIO FAJARDO NR FAJARDO, PR5007100071 cfsp63 · normal
- RIO SABANA AT SABANA, PR5006700030 cfsp67 · normal
- RIO GRANDE NR EL VERDE, PR5006420067 cfsp82 · above normal
- RIO MAMEYES NR SABANA, PR50065500137 cfsp87 · above normal
- RIO ESPIRITU SANTO NR RIO GRANDE, PR50063800128 cfsp89 · above normal
- LAGO CARITE AT SPILLWAY, PR50039995101 cfsno long-term record
- RIO DE LA PLATA AT CAYEY, PR5004080031 cfsno long-term record
- RIO BLANCO AT FLORIDA, PR5007550045 cfsno long-term record
- RIO GUAYANES AT CENTRAL ROIG, PR5008510019 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 349 | 93.74 | 27/35 | p8 |
Top water assets
- 67Cidra Damreservoir
- 67Comerio Ii Damreservoir
- 67Carite Damreservoir
- 67La Plata Damreservoir
- 67Fajardo Damreservoir
- 66Comerio I Damreservoir
- 66Las Curias Damreservoir
- 66Loiza Damreservoir
- 43Rio  Blanco Damreservoir
- 39Pozo De Bartolospring