USGS Water-Year Summary for Site 50075550

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	Available Parameters
	00045 Precipitation(Sum)
	72375 Elevation, lake/res, LMSL(Obs.) [OLDPR]
	72379 Elevation, lake/res, PRVD02(Obs.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

50075550 LAGO ICACOS AT DAMSITE, PR

LOCATION - Lat 18°15'49.26", long 65°47'05.95" referenced to North American Datum of 1927, Naguabo Municipio, PR, Hydrologic Unit 21010005, in Caribbean National Forest at State Road 191 at El Yunque, 5.5 mi (1.68 km) east of Cubuy School, 4.3 mi (1.31 km) west of Sonadora School in Ceiba, and 6.1 mi (1.86 km) northwest of Naguabo plaza.

DRAINAGE AREA - 2.85 mi². (7.38 km2).

REVISIONS HISTORY - Datum of gage was previously reported in the site file as 1443 ft (439.8 m) above NGVD29 and LMSL-Old PR. NGVD29 datum does not exist in Puerto Rico and the correct LMSL-Old PR elevation is 1800 ft. (548.6 m), published historical records did not reflect this site file typo. Revised to PRVD02 Datum in October 2022.

SURFACE-WATER RECORDS

PERIOD OF RECORD - March 10, 2004 to September 30, 2011, October 1, 2011 to October 1, 2014 lake dry. October 2, 2014 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 Electric Power Authority (PREPA).

REMARKS - Lago Icacos, a small reservoir built in 1930, is part of the Río Blanco Hydroelectric Power System. The reservoir's original storage capacity was 15.506 acre-ft (0.0191 hm3). The bathymetric survey conducted in March 2004 indicates a storage capacity of 6.030 acre-ft (0.007 hm3) or 39% of the original storage capacity, and a maximum depth of 17 ft (5.3 m). The reservoir operational function was modified in the 1970's to also meet public-supply water needs at the Río Blanco Filtration Plant (Puerto Rico Electric Power Authority (PREPA), written communication, March 2005). The Lago Icacos dam is a concrete-gravity structure 25.98 ft (7.92 m) high, 155 ft (47.24 m) long, with a spillway section of 90 ft (27.43 m) long. The spillway has an elevation of 1,860.01 ft (566.93 m) above mean sea level (Puerto Rico Electric Power Authority (PREPA), written communication, March 2005). The Lago Icacos Dam impounds the waters of the Ri'o Icacos, and has a surface area of 0.00138 mi² (0.0036 km2) at the spillway elevation. New capacity table based on US Geological Survey Water-Resources Investigation Report 07-5033, March 2004.

EXTREMES FOR PERIOD OF RECORD - Maximum elevation 1,899.87 ft (579.08 m), January 24, 2007; minimum elevation, 1,817.43 ft (553.95 m), September 22, 2006.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - October 2018 to current year.

INSTRUMENTATION - Tipping bucket precipitation gage and data collection platform – 15 minutes interval.