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Somerset County Flood Warning Stage for this gage is 8.5 feet. Somerset County Flood Alarm Stage for this gage is 9.5 feet.
LOCATION. --Lat 40°30'10", long 74°35'15" referenced to North American Datum of 1983, Millstone Borough, Somerset County, NJ, Hydrologic Unit 02030105, on left bank at downstream side of bridge on County Route 514 (Amwell Road), in Millstone Borough, 2.7 mi south of Manville, and 4.4 mi upstream from mouth.
DRAINAGE AREA. --264 mi2.
PERIOD OF RECORD. --Continuous-record gaging station, water years 1903-04. Annual maximum, water years 1999 to current year.
GAGE. --Water-stage recorder. Datum of gage is 24.4 ft above NGVD of 1929. Diurnal fluctuations in gage height and water temperature possibly due to flow pattern in sewage effluent that enter the river upstream of gage.
EXTREMES FOR PERIOD OF RECORD. --Maximum gage height, 22.30 ft, Sep 17, 1999.
COOPERATION. --This gage is funded by the Somerset County and USGS.