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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2025
50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR
LOCATION - Lat 18°14'33.70", long 66°00'34.52" referenced to North American Datum of 1927, Caguas Municipio, PR, Hydrologic Unit 21010005, on right bank 250 ft (76 m) upstream from bridge on State Road 189, 1.2 mi (1.9 km) downstream from Río Turabo, and 1.8 mi (2.9 km) east of Caguas plaza.
DRAINAGE AREA - 89.8 mi². (233 km2).
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 4, 1945 to February 25, 1959; low-flow and peak flow measurements only, February 25 to November 17, 1959; monthly measurements only. November 17, 1959 to current year.
GAGE -
Water-stage recorder and crest-stage gage, satellite telemetry at station. Datum of gage is 142.85 ft (43.5 m) above Puerto Rico Vertical Datum of 2002 (PRVD02). Elevation or datum of gage was previously reported as 164 ft (50 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 - February 25, 1959 to current year.
PERIOD OF DAILY RECORD - SUSPENDED SEDIMENT DISCHARGE: October 1, 1983 to September 30, 2004; discontinued.
