Largest Reservoirs in Puerto Rico

Puerto Rico has 35 dams with recorded storage capacity. The largest is Toa Vaca Dam with 60,143 acre-feet of maximum storage. One acre-foot equals about 326,000 gallons — enough to supply roughly two households for a year.

#	Dam	County	Max Storage (acre-ft)	Height (ft)	Purpose	Year
1	Toa Vaca Dam	Villalba	60,143	215	Irrigation	1972
2	Cerrillos Dam	Ponce	58,750	323	Flood Risk Reduction	1992
3	Caonillas Dam	Jayuya	54,970	235	Hydroelectric	1948
4	Dos Bocas Dam	Arecibo	50,000	188	Hydroelectric	1942
5	Guajataca Dam	Isabela	49,200	120	Hydroelectric	1927
6	Portugues Dam	Ponce	46,000	220	Flood Risk Reduction	2015
7	La Plata Dam	Toa Alta	37,000	131	Water Supply	1974
8	Loiza Dam	Trujillo Alto	30,000	95	Hydroelectric	1954
9	Lucchetti Dam	Yauco	20,800	169	Irrigation	1952
10	Guayo Dam	Adjuntas	19,000	190	Hydroelectric	1956
11	Carite Dam	Guayama	17,349	104	Hydroelectric	1913
12	Patillas Dam	Patillas	17,073	127	Hydroelectric	1976
13	Cidra Dam	Cidra	10,800	115	Water Supply	1946
14	Guayabal Dam	Villalba	7,600	130	Irrigation	1913
15	Garzas Dam	Adjuntas	5,500	201	Hydroelectric	1943
16	Fajardo Dam	Fajardo	4,455	115	Water Supply	2002
17	Matrullas Dam	Orocovis	3,590	120	Hydroelectric	1934
18	Loco Dam	Yauco	2,500	74	Irrigation	1951
19	Yahuecas Dam	Adjuntas	2,400	90	Hydroelectric	1956
20	Ana Mariaâ V Dam	Ponce	2,205	53	Irrigation	1939
21	Guineo Dam	Orocovis	2,180	115	Hydroelectric	1931
22	Comerio Ii Dam	Comerío	1,825	128	Hydroelectric	1913
23	Poncenaâ Dam	Juana Díaz	1,742	48	Irrigation	1939
24	Las Curias Dam	San Juan	1,425	75	Recreation	1946
25	Coamo Dam	Santa Isabel	1,380	65	Irrigation	1914
26	Prieto Dam	Maricao	880	98	Hydroelectric	1955
27	Adjuntas Dam	Adjuntas	760	80	Hydroelectric	1950
28	Ana Mariaâ Ii Dam	Ponce	563	40	Irrigation	1939
29	Comerio I Dam	Comerío	500	47	Hydroelectric	1907
30	Melania Dam	Guayama	456	30	Irrigation	1914
31	Lago Regulador	Isabela	399	40	Water Supply	1996
32	Vivi Dam	Utuado	380	85	Hydroelectric	1950
33	Daguey Dam Structure 3	Añasco	334	50	Flood Risk Reduction	1978
34	Pellejas Dam	Adjuntas	280	50	Hydroelectric	1950
35	Ajies Dam Structure 2a	Añasco	95	52	Flood Risk Reduction	1984

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