USGS Water-Year Summary 2021
01400010 NORTH BRANCH RARITAN RIVER AT SOUTH BRANCH, NJ
LOCATION - Lat 40°33'24", long 74°41'15" referenced to North American Datum of 1983, Bridgewater Township, Somerset County, NJ, Hydrologic Unit 02030105, on upstream left wingwall of bridge on Old York Road (County Route 567), 0.8 mi northeast of village of South Branch, and 500 ft upstream from confluence with South Branch Raritan River.
DRAINAGE AREA - 190 mi².
PERIOD OF RECORD - Annual maximum gage, water years 1993 to 2013. Continuous-record gage-height station, October 2013 to current year.
GAGE - Water-stage recorder with telemetry and crest-stage gage. Datum of gage is 46.03 ft above NGVD of 1929.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Aug 28, 1971 reached a stage of 15.5 ft (from high-water mark).
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 18.98 ft, Sep 16, 1999.