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Water-Year Summary for Site 50059000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
62614 Elevation, lake/res, NGVD29(Obs.)  

Water year 2020: 2020-10-01 to 2021-09-30

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USGS Water-Year Summary 2020
LOCATION - Lat 18°19'47.66", long 66°01'00.01" referenced to North American Datum of 1927, Trujillo Alto Municipio, PR, Hydrologic Unit 21010005, at pumpsite at damsite and 1.9 mi (3.1 km) south of Trujillo Alto plaza.
DRAINAGE AREA - 208 mi², (539 km2).
PERIOD OF RECORD - December 1987 to current year.
GAGE - Water-stage recorder, satellite and radio telemetry at station. Elevation of gage is above National Geodetic Vertical Datum (NGVD) of 1929, feet.
REMARKS - The reservoir is formed by the Loíza Dam, a concrete structure completed in 1954. Usable capacity of impoundment is 30,000 acre-ft (37 hm3). Out flow from lake is controlled by five slide gates in power plant and pump intake structure, four sluicegates, and concrete spillway with eight radial gates. Lake is used for municipal water supply and intermittent power generation. New capacity table based on US Geological Survey Water-Resources Investigations Report 99-4143, 1996. Prior to October 1994, published as Lago Loíza at Damsite.
EXTREMES FOR PERIOD OF RECORD - Maximum elevation 147.42 ft (44.93 m), September 18, 1989; minimum elevation, 108.52 ft (33.08 m), July 18, 1994.
PERIOD OF RECORD - Water years 1974 to September 2012, discontinued.