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USGS Water-Year Summary 2024
50141500 LAGO GUAYO AT DAMSITE NEAR CASTANER, PR
LOCATION - Lat 18°12'45.51", long 66°50'08.02" referenced to North American Datum of 1927, Adjuntas Municipio, PR, Hydrologic Unit 21010003, at Lago Guayo Dam on Río Guayo, 1.1 mi (1.8 km) southwest of Lago Yahuecas, 2.6 mi (4.2 km) southwest of Lago Prieto, 2.1 mi (3.4 km) north of Castañer, and 6 mi (9.6 km) west of Adjuntas.
DRAINAGE AREA - 9.60 mi². (24.9 km2).
REVISIONS HISTORY - Datum of gage was previously reported in the site file as 1400 ft (426.7 m) above NGVD29 and LMSL-Old PR. NGVD29 datum does not exist in Puerto Rico. Revised to PRVD02 Datum in October 2022.
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 23, 1980 to January 30, 1985, June 9, 1989 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).
REMARKS - Lago Guayo was completed in 1956. The dam is on Río Guayo and is the largest in the Southwestern Puerto Rico Project. The maximum storage is 17,400 acre-ft (21.5 hm3) for power and irrigation. The dam is a concrete gravity structure with a total length of 555 ft (169 m), a maximum structural height of 190 ft (58 m), and a maximum width at the base of 145 ft (44 m). The ungated overflow spillway with a crest elevation of 60 ft (18.29 m) and a crest length of 220 ft (67 m) was designed to pass a maximum flood of 30,200 ft³/s (855 m3/s), at a reservoir elevation of 70 ft (21.34 m). Timber flashboards that were added to increase storage capacity were subsequently removed and their use discontinued. Prior to October 1994, published as Lago Guayo near Castañer.
EXTREMES FOR PERIOD OF RECORD - Maximum elevation,1,465.35 ft (446.64 m), September 22, 1998; minimum elevation recorded, 1,415.43 ft (431.42 m), June 2, 1990, but may have been less during period of no gage-height record June 2-5, 1990.
