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Lago Guajataca at Damsite - 50010800


Photo of Lago Guajataca by Senén Guzmán-Ríos, May 1993
Photo of Lago Guajataca by Senén Guzmán-Ríos, USGS.

Lago Guajataca is located in the municipio of Quebradillas and was constructed by the Puerto Rico Electric Power Authority (PREPA) in 1929.  The dam was originally intended for public water and irrigation water supply. In 1995, about 52 percent of the water was used for public water supply and 48 percent for irrigation.

 

 

Real-time Reservoir Level

Real-time resevoir level graph updated hourly with the exception of emergency transmissions which are at 5 minute intervals. To view real-time data, follow the link below.

Lago Guajataca at Damsite - 50010800

Guajataca Basin Map


Click on Lake symbol for combined real-time reservoir and rainfall information

50010800 Guajataca Basin Map

 

The Lago Guajataca has a drainage area of 24.6 square miles (63.7 square kilometers).  Originally, the reservoir had a water storage capacity of 39,286 acre-feet (48.5 million cubic meters), but by 1999 the capacity had been reduced by sediment infilling to 34,276 acre-feet (42.3 million cubic meters).  During 1995, the reservoir had a withdrawal of about 48 million gallons per day (182 million liters per day); 23 million gallons per day (87 million liters per day) were used to agricultural irrigation purposes, and the other 25 million gallons per day (95 million liters per day) were used to supply potable water to a population of about 179,000 persons among the municipios of Aguadilla, Isabela, Moca, Aguada, and Quebradillas.

Chart correlating lake level elevation to water volume: Lago Guajataca at Damsite - 50010800

The U.S. Geological Survey, in cooperation with PREPA, has produced a number of reports regarding effects of sediment infilling on storage capacity of Lago Guajataca, including:

Soler-López, L.R., 2000, Sedimentation survey of Lago Guajataca, Puerto Rico, January 1999: U.S. Geological Survey Water-Resources Investigations Report 00-4044, 20 p., 1 pl.

In addition, the U.S. Geological Survey, in cooperation with local government agencies, has produced a number of reports regarding the effects of sediment infilling on the storage capacity of principle water-supply reservoirs of Puerto Rico.  The results of these surveys are summarized in "Sedimentation survey results of the principal water supply reservoirs of Puerto Rico,"

These reports can be purchased at a nominal cost by contacting Information Desk at the U.S. Geological Survey, GSA Center, 651 Federal Drive, Suite 400-15, Guaynabo, PR 00965, 787-749-4346 ext. 296.  Please contact Water-Use Information, 787-749-4346 ext. 259, if you have other questions regarding water supply in Puerto Rico.

The table below shows the relationship between reservoir level and available water. This information is presented in graphical format in the figure above. Note that an acre-foot is a volume of water that would cover an acre (43,560 square feet) to a depth of 1 foot.

 

Lago Guajataca - 50010800

Reservoir elevation in

Volume in

meters

feet

acre-ft

million cubic
meters

196.9 646.0 34,276.83 42.28
195.9 642.7 31,544.34 38.91
194.9 639.4 28,892.59 35.64
193.9 636.2 26,328.47 32.48
192.9 632.9 23,837.17 29.40
191.9 629.6 21,469.46 26.48
190.9 626.3 19,228.13 23.72
189.9 623.0 17,147.54 21.15
188.9 619.8 15,193.27 18.74
187.9 616.5 13,395.80 16.52
186.9 613.2 11,712.18 14.45
185.9 609.9 10,220.44 12.61
184.9 606.6 8,821.63 10.88
183.9 603.3 7,539.25 9.30
182.9 600.1 6,336.94 7.82
181.9 596.8 5,253.55 6.48
180.9 593.5 4,247.89 5.24
179.9 590.2 3,375.11 4.16
178.9 586.9 2,586.13 3.19
177.9 583.7 1,942.06 2.40
176.9 580.4 1,368.67 1.69
175.9 577.1 912.99 1.13
174.9 573.8 510.67 0.63
173.9 570.5 291.66 0.36
172.9 567.3 130.25 0.16
171.9 564.0 58.33 0.07
170.9 560.7 13.80 0.02
169.9 557.4 0.00 0.00


Top view of Guajataca Reservoir.  Photo by Matthew Larsen, 1999.
Oblique aerial view of the Lago Guajataca Reservoir.  Photo by Matthew Larsen, USGS.



Photo of Lago Guajataca by Ramon Carrasquillo, January 1999
Photo of Lago Guajataca by Ramon Carrasquillo, USGS.


 
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