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Water Resources of the Caribbean

Reservoirs in Puerto Rico

Upstream view of Lago Dos Bocas resevoir. Photo by Matthew Larsen, USGS
Upstream view of Lago Dos Bocas reservoir.  Photo by Matthew Larsen, USGS.
Nearly 45 percent of public water supply is provided by the reservoirs of Puerto Rico. There are currently eight major water supply reservoirs in Puerto Rico, and they are Lago Guajataca, Lago Loíza, Lago La Plata, Lago de Cidra, Lago Toa Vaca, Lago Cerrillos, Lago Caonillas, and Lago Dos Bocas.

The U.S. Geological Survey (USGS), in cooperation with the Puerto Rico Electric Power Authority (PREPA) and Puerto Rico Aqueduct and Sewer Authority (PRASA), has a long-term program of monitoring reservoir levels and water quality.  In addition, the USGS has conducted a number of sedimentation surveys of water supply reservoirs to determine how fast the water storage capacity of these reservoirs is being reduced by infilling sediment.  Recently, the USGS has summarized the results of these reservoir sedimentation surveys. They found that a number of reservoirs, but particularly Lago Loíza and Lago Dos Bocas, are filling more rapidly than was projected at the time they were built.

To learn more about a particular reservoir, including current reservoir levels, click on the name of the reservoir below.

Select a station number to view graph(s) and other data for the station.
A table of recent rainfall is also available.

Provisional Data Subject to Revision

Río Guajataca Basin
50010800 Lago Guajataca at Damsite
Río Grande de Arecibo Basin
50026140 Lago Caonillas at Damsite near Utuado
50027100 Lago Dos Bocas at Damsite near Utuado
Río de la Plata Basin
50045000 Lago la Plata at Damsite near Toa Alta
Río de Bayamón Basin
50047550 Lago de Cidra at Damsite near Cidra
Río Grande de Loíza Basin
50059000 Lago Loiza at Damsite near Trujillo Alto
Río Jacaguas Basin
50111210 Lago Toa Vaca at Damsite near Villalba
Río Bucaná Basin
50113950 Lago Cerrillos at Damsite near Ponce

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