NOTICE: This continuous water-quality monitor (water temperature, chlorophyll, and phycocyanin) will be discontinued on September 1, 2021, due to completion of the data collection portion of the Downstream Fate and Transport of Cyanobacteria and Cyanotoxins in the Raritan River Basin, New Jersey study.

SURFACE-WATER RECORDS
LOCATION.--Lat 40°38'24", long 74°54'56" referenced to North American Datum of 1983, Clinton Town, Hunterdon County, NJ, Hydrologic Unit 02030105, 1,800 ft downstream from dam at Spruce Run Reservoir, 0.2 mi north of Clinton, 0.3 mi upstream from mouth, and 2.2 mi southwest of High Bridge.
DRAINAGE AREA.--41.3 mi².
PERIOD OF RECORD.--May 1959 to current year.
REVISED RECORDS.--WDR US-2011: 1967-68(M), 1970(M), 1972-75(M), 1978-79(M), 1983-84(M), 1987(M), 1997(M), 2004-10(M).
GAGE.--Water-stage and precipitation recorder with telemetry. Concrete control since Mar 15, 1964. Datum of gage is 193.5 ft above NGVD of 1929. May to November 1959, non-recording gage; Nov 25, 1959 to Jul 23, 1961, water-stage recorder at site 1,800 ft upstream and at datum 1.41 ft lower; Jul 24, 1961 to Mar 14, 1964, water-stage recorder at site 1,500 ft upstream at datum 1.41 ft lower.
REMARKS.--Records fair, except for estimated discharges, which are poor. Flow regulated by Spruce Run Reservoir since August 1963 (station 01396790).
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 4,080 ft³/s, Apr 2, 1970, gage height, 5.17 ft; minimum discharge, 0.00 ft³/s, Aug 22, 1963, as a result of reservoir filling from August 1963 to March 1964.

WATER-QUALITY RECORDS
PERIOD OF RECORD.--Water years 1959-71, 1973-75, 1977-91, 2005, 2007-08.
REMARKS.--Cooperative Network Site Descriptor: Trace Element Assessment (303d) special study site.
COOPERATION.--Physical measurements and samples for laboratory analyses were provided by personnel of the NJ Department of Environmental Protection.

Peak Flood Chart

National Weather Service flood stage for this gage is 4 ft.

Rain gage is available from this location at this link.