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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2025
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 downstream 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.
SURFACE-WATER RECORDS
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 44.88 ft above NAVD of 1988.
REMARKS - Flow regulated by Spruce Run (see 01396790) and Round Valley Reservoirs. Peak stages at this gage maybe affected by backwater from the North Branch Raritan River. Annual peak data can be obtained by selecting Peak streamflow from the 'Available data for this site' drop-down menu above or by using this link.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 20.29 ft, Sep 16, 1999.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1976-83, 1998 to current year.
REMARKS - Discrete water-quality data were collected as part of the New Jersey Ambient Surface-Water-Quality Monitoring Network.
