Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

* We've detected you're using a mobile device. Find our Next Generation Station Page here.
Click to hideNews Bulletins

Water-Year Summary for Site 50141100

Click to hide Water-Year Summary instructions and information
  • 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

Print this page
USGS Water-Year Summary 2020
LOCATION - Lat 18°13'13.57", long 66°49'00.58" referenced to North American Datum of 1927, Adjuntas Municipio, PR, Hydrologic Unit 21010003, at Yahuecas Dam on Río Blanco, 1.1 mi (1.8 km) northeast of Lago Guayo, 2.8 mi (4.5 km) northeast of Castañer, 3.8 mi (6.1 km) northeast of Lago Prieto, and about 4.0 mi (6.4 km) northwest of Adjuntas.
DRAINAGE AREA - 17.4 mi², (45.1 km2).
PERIOD OF RECORD - April 23 1980 to January 30, 1985, October 14, 2004 to October 25, 2016.
GAGE - Water-stage recorder, satellite and radio telemetry at station. Elevation of gage is above National Geodetic Vertical Datum (NGVD) of 1929, feet. Prior to January 1985, add 1,400 ft (476.72 m) to obtain correct mean sea level elevations.
REMARKS - Lago Yahuecas was completed in 1956. The dam is a unit of the southwestern Puerto Rico project owned by Puerto Rico Electric and Power Authority (PREPA) and provides a maximum storage of 271 acre-ft (0.33 hm3) (based data from US Geological Survey Water-Resources Investigation Report 98-4259, March 1997) for power and irrigation. The dam is a concrete gravity structure with a total length of 450 ft (137.2 m), a maximum structural height of 90 ft (27.4 m), and a maximum base width of 60 ft (18.3 m). The spillway is an ungated overflow type with a crest elevation of 1,471 ft (448.36 m) and a crest length of 200 ft (61 m); it was designed to pass a maximum flood of 38,000 ft³/s (1,076 m3/s) at a reservoir elevation of 1,484 ft (452.32 m). Timber flashboards, originally installed on the spillway crest, were subsequently removed and their use discontinued. Diversions are conveyed to Lago Guayo by an 11 ft (3.4 m) diameter, 6,470 ft (1,972 m) long tunnel, mostly unlined.
EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 1,476.61 ft (450.07 m), August 24, 2014; minimum elevation, 1,446.67 ft (440.94 m), September 9, 1984.