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
Funding for this site is provided by:
Lat 40°36'00", long 74°40'26"
referenced to North American Datum of 1983, Bridgewater Township,
Somerset County, NJ, Hydrologic Unit 02030105, on left bank, at
upstream side of bridge on County Route 614 (Easton Turnpike) in
village of North Branch, 0.1 mi downstream from River Brook, and 3.6 mi
upstream from confluence with South Branch Raritan River.
PERIOD OF RECORD.--
Continuous-record discharge station, water
years 1977-81. Annual maximum gage, water years 1982-95, 1997 to
On Mar 8, 2019, gage-height for the period
Jan 2, 2017 to Jan 26, 2017 was revised based on hydrographic
Water-stage recorder with telemetry and crest-stage gage.
Datum of gage is 56.94 ft above NGVD of 1929.
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
EXTREMES FOR PERIOD OF RECORD.--
Maximum discharge, 27,800 ft³/s,
Sep 16, 1999, gage height, 21.53 ft.
National Weather Service flood stage for
this gage is 12.3 ft.