Dams in Puerto Rico

36Total Dams
36High Hazard
0Significant
0Low Hazard

Dam Safety in Puerto Rico

Puerto Rico has 36 dams tracked in the National Inventory of Dams. Of these, 36 (100%) are classified as high hazard — meaning failure would probably cause loss of human life — and 0 are classified as significant hazard. Currently, 12 dams in the state have a condition assessment of poor or unsatisfactory, indicating recognized safety deficiencies.

The average dam in Puerto Rico is 73 years old. As dams age, inspection frequency and maintenance become increasingly important for ensuring public safety. The most common purpose for dams in Puerto Rico is hydroelectric, accounting for 17 of the state's dams.

Use the search above to find dams near any address in Puerto Rico, or browse by county below. Each dam listing includes its hazard potential classification, condition assessment, physical characteristics, and inspection history from the NID.

Puerto Rico Dam Facts

Total Dams36
High Hazard Dams36
Average Dam Age73 years
Tallest Dam323 ft
Largest Reservoir60,143 acre-ft
Poor/Unsatisfactory Condition12

Notable Dams in Puerto Rico

Cerrillos Dam323 ftHighCaonillas Dam235 ftHighPortugues Dam220 ftHighToa Vaca Dam215 ftHighGarzas Dam201 ftHigh

Explore Puerto Rico Dams

Oldest DamsEarliest dams in Puerto RicoTallest DamsHighest dams in Puerto Rico

Counties in Puerto Rico

Adjuntas5 dams5 high hazardArecibo1 dams1 high hazardAñasco2 dams2 high hazardCidra1 dams1 high hazardComerío2 dams2 high hazardFajardo1 dams1 high hazardGuayama2 dams2 high hazardIsabela2 dams2 high hazardJayuya1 dams1 high hazardJuana Díaz1 dams1 high hazardMaricao1 dams1 high hazardNaguabo1 dams1 high hazardOrocovis2 dams2 high hazardPatillas1 dams1 high hazardPonce4 dams4 high hazardSan Juan1 dams1 high hazardSanta Isabel1 dams1 high hazardToa Alta1 dams1 high hazardTrujillo Alto1 dams1 high hazardUtuado1 dams1 high hazardVillalba2 dams2 high hazardYauco2 dams2 high hazard

High Hazard Dams in Puerto Rico

DamCountyHeightConditionPurpose
Cerrillos DamPonce323 ftSatisfactoryFlood Risk Reduction
Caonillas DamJayuya235 ftSatisfactoryHydroelectric
Portugues DamPonce220 ftSatisfactoryFlood Risk Reduction
Toa Vaca DamVillalba215 ftSatisfactoryIrrigation
Garzas DamAdjuntas201 ftUnsatisfactoryHydroelectric
Guayo DamAdjuntas190 ftPoorHydroelectric
Dos Bocas DamArecibo188 ftSatisfactoryHydroelectric
Lucchetti DamYauco169 ftSatisfactoryIrrigation
La Plata DamToa Alta131 ftSatisfactoryWater Supply
Guayabal DamVillalba130 ftPoorIrrigation
Comerio Ii DamComerío128 ftPoorHydroelectric
Patillas DamPatillas127 ftPoorHydroelectric
Matrullas DamOrocovis120 ftUnsatisfactoryHydroelectric
Guajataca DamIsabela120 ftPoorHydroelectric
Cidra DamCidra115 ftSatisfactoryWater Supply
Fajardo DamFajardo115 ftSatisfactoryWater Supply
Guineo DamOrocovis115 ftPoorHydroelectric
Carite DamGuayama104 ftPoorHydroelectric
Prieto DamMaricao98 ftSatisfactoryHydroelectric
Loiza DamTrujillo Alto95 ftSatisfactoryHydroelectric
Yahuecas DamAdjuntas90 ftSatisfactoryHydroelectric
Vivi DamUtuado85 ftSatisfactoryHydroelectric
Adjuntas DamAdjuntas80 ftSatisfactoryHydroelectric
Las Curias DamSan Juan75 ftSatisfactoryRecreation
Loco DamYauco74 ftSatisfactoryIrrigation
Coamo DamSanta Isabel65 ftSatisfactoryIrrigation
Rio �� Blanco DamNaguabo64 ftSatisfactoryWater Supply
Ana Mariaâ V DamPonce53 ftSatisfactoryIrrigation
Ajies Dam Structure 2aAñasco52 ftPoorFlood Risk Reduction
Pellejas DamAdjuntas50 ftSatisfactoryHydroelectric
Daguey Dam Structure 3Añasco50 ftPoorFlood Risk Reduction
Poncenaâ DamJuana Díaz48 ftSatisfactoryIrrigation
Comerio I DamComerío47 ftPoorHydroelectric
Lago ReguladorIsabela40 ftSatisfactoryWater Supply
Ana Mariaâ Ii DamPonce40 ftSatisfactoryIrrigation
Melania DamGuayama30 ftSatisfactoryIrrigation