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USGS Water-Year Summary 2024
50032290 LAGO EL GUINEO AT DAMSITE NEAR VILLALBA, PR
LOCATION - Lat 18°09'40.41", long 66°31'35.07" referenced to North American Datum of 1927, Barranquitas Municipio, PR, Hydrologic Unit 21010002, at damsite on Río Toro Negro, 3 mi (4.8 km) northwest from Villalba plaza, and 1.9 mi (3.1 km) northeast of Cerro Maravillas. The reservoir itself fixes the territorial limits between the municipalities of Ciales and Orocovis.
DRAINAGE AREA - 1.64 mi². (4.25 km2).
REVISIONS HISTORY - Datum of gage was previously reported in the site file as 2960 ft (902.2 m) above NGVD29 and LMSL-Old PR. NGVD29 datum does not exist in Puerto Rico and the correct LMSL-Old PR elevation is 2900 ft (883.9 m), published historical records did not reflect this site file typo. Revised to PRVD02 Datum in October 2022.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1988 to current year.
GAGE - Water-stage recorder, satellite and radio telemetry at station. Datum of gage is above Local Mean Sea Level (LMSL- Old PR) and above Puerto Rico Vertical Datum of 2002 (PRVD02).
COOPERATION - Puerto Rico Electrical Power Authority (PREPA).
REMARKS - Lago El Guineo was completed in 1931. It provides a maximum storage of approximately 2,180 acre-ft (2.688 hm3) for power and irrigation. Waters are discharged through an outlet power tunnel into the Rio Toro Negro and conveyed to the head water works of Toro Negro Hydroelectric Plant No. 2, for energy generation at the Toro Negro Hydroelectric Plant No. 1, and are discharged into the Lago Guayabal Reservoir to be later used for irrigation at South Coast Irrigation System. The dam is rockfill with a vertical concrete corewall, rock toes, and riprap facing of upstream slope, with a total length of 565 ft (172 m), a maximum structural height of 125 ft (38 m) to top of corewall. At a maximum reservoir water surface elevation the uncontrolled morning-glory tunnel spillway crest has an elevation of 2,960 ft (902 m) above mean sea level and a design capacity of 7,000 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum elevation 2,964.94 ft (903.71 m), August 23, 2011; minimum elevation 2,919.79 ft (889.95 m), May 27, 1988.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - October 2016 to current year.
INSTRUMENTATION - Tipping bucket precipitation gage and data collection platform – 15 minutes interval.
