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Scientific Investigations Map 3118

Sedimentation Survey of Lago de Cidra, Puerto Rico, August 2007

By Luis R. Soler-López

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Lago de Cidra is a reservoir located on the confluence of Río de Bayamón, Río Sabana, and Quebrada Prieta, in the municipality of Cidra in east-central Puerto Rico, about 3.0 kilometers northeast of the town of Cidra. The dam is owned and operated by the Puerto Rico Aqueduct and Sewer Authority (PRASA), and was constructed in 1946 as a 6.54-million-cubic-meter supplemental water supply for the San Juan metropolitan area.
The reservoir impounds the waters of Río de Bayamón, Río Sabana and Quebrada Prieta. The reservoir has a drainage area of 21.4 square kilometers. The dam is a concrete gravity and earthfill structure with a length of approximately 165 meters and a structural height of 24 meters. The spillway portion of the dam is an ungated ogee crest about 40 meters long with a crest elevation of 403.00 meters above mean sea level. Additional information and operational procedures are listed in Soler-López (1999). During August 14-15, 2007, the U.S. Geological Survey (USGS), Caribbean Water Science Center (CWSC), in cooperation with the PRASA, conducted a bathymetric survey of Lago de Cidra to update the reservoir storage capacity and actualize the reservoir sedimentation rate by comparing the 2007 data with the previous 1997 bathymetric survey data. The purpose of this report is to describe and document the USGS sedimentation survey conducted at Lago de Cidra during August 2007, including the methods used to update the reservoir storage capacity, sedimentation rates, and areas of substantial sediment accumulation since 1997.

First posted August 2010

For additional information contact:
Luis R. Soler-López
U.S. Geological Survey
Caribbean Water Science Center
GSA Center building 651
Federal Drive, Suite 400-15
Guaynabo, P.R. 00965

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.


Suggested citation:

L.R. Soler-López., 2010, Sedimentation Survey of Lago de Cidra, Puerto Rico, August 2007: U.S. Geological Survey Scientific Investigations Map 3118, 1 plate., available at

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