USGS Water-Year Summary 2021
01402500 MILLSTONE RIVER AT MILLSTONE, NJ
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 discharge station, water years 1903-04. Continuous-record gage-height station, water years 1999 to current year.
GAGE - Water-stage recorder with telemetry and crest-stage gage. Datum of gage is 24.4 ft above NGVD of 1929.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 22.34 ft, Aug 28, 2011.