SURFACE-WATER RECORDS
LOCATION.--Lat 40°31'47", long 74°35'18" referenced to North American Datum of 1983, Manville Borough, Somerset County, NJ, Hydrologic Unit 02030105, on left bank of main channel at downstream side of bridge on Wilhouski Street (Manville Causeway), in Weston, 0.8 mi south of Alma White College, 1.5 mi upstream of confluence with Raritan River, and 1.9 mi north of Millstone. Station is approximately 1.5 mi upstream of confluence with Raritan 
DRAINAGE AREA.--271 mi².
PERIOD OF RECORD.--Water years 1997, 1999 to current year.
GAGE.--Water-stage recorder with telemetry and crest-stage gage. Datum of gage is 21.9 ft above NGVD of 1929. Prior to Oct 17, 2017 water-stage recorder was located at downstream center pier on bridge on Wilhouski Street (Manville Causeway) over bypass channel at same datum.
REMARKS.--Under some flow conditions, gage is affected by backwater from Raritan River. Diurnal fluctuations in gage height possibly due to flow pattern in sewage effluent that enter the river upstream of gage. 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, 23.21 ft, Sep 17, 1999.
PERIOD OF RECORD¹.--Water years 1976-91, 2006-07.
¹ Water-Quality Records

Peak Flood Chart

National Weather Service flood stage for this gage is 11.5 ft.