SURFACE-WATER RECORDS
LOCATION.--Lat 40°19'09", long 74°06'54" referenced to North American Datum of 1983, Colts Neck Township, Monmouth County, NJ, Hydrologic Unit 02030104, at dam on Swimming River, 3.3 mi southwest of Red Bank, and 4.8 mi upstream from mouth.
DRAINAGE AREA.--49.2 mi².
PERIOD OF RECORD.--Continuous-record reservoir station, August 1922 to current year. Unpublished reservoir station records, August 1922 to September 1999, available from the USGS New Jersey Water Science Center. Records from October 1999 to September 2005 published as 01407500.
REVISED RECORDS.--WDR NJ-00-1: 1999 (elevation, contents).
GAGE.--Water-stage recorder with telemetry above concrete dam. Datum of gage is National Geodetic Vertical Datum of 1929. Prior to Jan 19, 1962, at site 800 ft upstream at datum 17.67 ft lower. Jan 19 to Mar 30, 1962, non-recording gage, 700 ft upstream at datum 13.87 ft lower.
REMARKS.--Reservoir formed by concrete core and earth embankment dam with a Trenton-type overflow spillway. Capacity at spillway level, 2,610,000,000 gal, elevation, 35.0 ft. Reservoir used for storage and water diversion by New Jersey-American Water Company. Reservoir enlarged and dam raised in 1962. Outflow is controlled by gates on a pipe. Annual extremes beginning in water year 2014 can be obtained by using this link. Prior to water year 2014, annual extremes can be obtained on the respective annual water year summary.
EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 3,240,000,000 gal, Aug 28, 2011, elevation 37.92 ft. Minimum contents and elevation undetermined.