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°33'04", long 74°32'54" referenced to North American Datum of 1983, Franklin Township, Somerset County, NJ, Hydrologic Unit 02030105, on right bank 1,000 ft downstream from former Calco Dam and Cuckels Brook, 1,400 ft upstream from bridge on Interstate 287, 1.2 mi downstream from Millstone River, and 1.2 mi southwest of Bound Brook.
DRAINAGE AREA.--785 mi² of which 11 mi² probably is noncontributing, draining into the Delaware and Raritan Canal.
PERIOD OF RECORD.--September 1903 to March 1909, October 1944 to current year. Monthly discharge only for some periods, published in WSP 1302. Prior to October 1966 published as "Raritan River at Bound Brook" (station 01403000). Records prior to October 1966 are equivalent to the present records if the effluents from American Cyanamid Company and Somerset Raritan Valley Sewerage Authority and the discharge of Cuckels Brook are added.
REVISED RECORDS.--WSP 1552: 1903-07, 1946(M), 1949, 1952(P).
GAGE.--Water-stage recorder with telemetry. Datum of gage is NGVD of 1929. Sep 12, 1903 to Mar 31, 1909, non-recording gages at highway bridge (Queens Bridge), 1.2 mi downstream at different datum. October 1944 to Sep 30, 1966, water-stage recorder and concrete control, 1,000 ft upstream at datum 18.06 ft higher.
REMARKS.--Records good, except for estimated discharges which are fair. Water diverted for municipal supply 1.2 mi above station by New Jersey American Water Company (formerly Elizabethtown Water Company). Flow regulated by Spruce Run (see 01396790) and Round Valley Reservoirs. Diversions to and releases from Round Valley Reservoir. Slight diurnal fluctuations at low flow. Flow includes sewage effluent from several treatment plants upstream of gage. Discharges above 46,000 ft³/s from rating curve extension on basis of flow-over-dam computation of peak flow.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 82,900 ft³/s, from rating curve extended above 46,000 ft³/s on basis of flow-over-dam computation of peak flow at Fieldville Dam, September 17, 1999, gage height, 42.13 ft, from high-water-mark in gage house; minimum discharge, 26 ft³/s December 31, 2001.

Peak Flood Chart

National Weather Service flood stage for this gage is 28.0 ft.

Forecasts for this gage are issued by the National Weather Service routinely year-round.
Forecast information is available here.