During winter months, cold and ice may result in inaccurate real-time gage height and streamflow data. Adjustments or deletions of this data can only be done after detailed analysis.

 

SURFACE-WATER RECORDS
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.
REMARKS.--Peak stages may be affected by variable-stage backwater from the confluence with the South 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, 18.98 ft, Sep 16, 1999.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Aug 28, 1971 reached a stage of 15.5 ft (from high-water mark).

Peak Flood Chart

National Weather Service flood stage for this gage is 8 ft.