USGS Water-Year Summary 2019
50093120 RIO GRANDE DE PATILLAS BLW LAGO PATILLAS, PR
LOCATION - Lat 18°00'59", long 66°01'25" referenced to North American Datum of 1927, Patillas Municipio, PR, Hydrologic Unit 21010004, on left bank, 0.83 mi (1.34 km) northwest from Patillas plaza, 0.35 mi (0.56 km) southwest from Patillas dam, and 2.2 mi (3.54 km) southeast from Segunda Unidad Jesús María Rodríguez School.
DRAINAGE AREA - 25.67 mi² of which 0.07 mi² probably is noncontributing.
PERIOD OF RECORD - October 2005 to current year.
GAGE - Water-stage recorder, satellite telemetry at station. Elevation of gage is 138 ft (42 m) above National Geodetic Vertical Datum (NGVD) of 1929, from topographic map.