During winter months, cold and ice may
result in inaccurate real-time lake or reservoir elevation data.
Adjustments or deletions of this data can only be done after detailed
Funding for this site is provided by:
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.
PERIOD OF RECORD.--
April 1962 to current year. Unpublished
records 1962 to 1998 available from the USGS New Jersey Water Science
Center. Prior to the 2006 water year, published as 01407500.
WDR NJ-00-1: 1999 (elevation, contents).
Water-stage recorder with telemetry. Datum of gage is
National Geodetic Vertical Datum of 1929.
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 extreme