USGS Water-Year Summary 2023
50057000 RIO GURABO AT GURABO, PR
LOCATION - Lat 18°15'30.56", long 65°58'05.07" referenced to North American Datum of 1927, Gurabo Municipio, PR, Hydrologic Unit 21010005, on left bank, at bridge on Highway 181, 0.3 mi (0.5 km) east of Gurabo, and 4.5 mi (7.6 km) upstream from Río Grande de Loíza.
DRAINAGE AREA - 60.2 mi². (156 km2).
REVISIONS HISTORY - Revisions: The maximum gage height and discharge for water years 2004, 2006, 2008-2011, was revised on Dec. 2, 2019, based on revision using upper end of Rating No. 42.1.
SURFACE-WATER RECORDS
PERIOD OF RECORD - 1958; occasional low-flow measurements only, January to September 1959; monthly measurements only. October 1959 to current year.
GAGE - Water-stage recorder, crest-stage gage, and satellite telemetry at station. Datum of gage is 131.0 ft. (39.9 m) above Puerto Rico Vertical Datum of 2002 (PRVD02). Prior to October 1, 1989 at datum 5 ft. (1.5 m) lower. Elevation or datum was previously reported as 150 ft. (45.72 m) above mean sea level and NGVD 29 and was established via topographic map and a new GNSS survey was used to establish a PRVD02 datum because the topographic map datum did not meet the new accuracy requirements.
WATER-QUALITY RECORDS
PERIOD OF RECORD - September 10, 1958 to November 4, 2015; discontinued.