USGS Water-Year Summary 2020
01398102 SOUTH BRANCH RARITAN RIVER AT SOUTH BRANCH, NJ
LOCATION - Lat 40°32'49", long 74°41'47" referenced to North American Datum of 1983, Branchburg Township, Somerset County, NJ, Hydrologic Unit 02030105, on right upstream wingwall of bridge on Studdiford Drive (South Branch Road) at village of South Branch, 0.8 mi upstream from confluence with North Branch Raritan River, and 2.7 mi southeast of Readington.
DRAINAGE AREA - 265 mi².
PERIOD OF RECORD - Continuous-record gage-height station 1998 to current year. Miscellaneous measurements, water years 1976-83, 1998 to current year.
GAGE - Water-stage recorder with telemetry and crest-stage gage. Datum of gage is 45.54 ft above NGVD of 1929.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 20.29 ft, Sep 16, 1999.
PERIOD OF RECORD - Water years 1976-83, 1998 to current year.