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Estimated flood stage for this gage is 6 feet. The Swimming River Reservoir begins to spill at 4.62 feet. Reservoir is at 100% capacity at 5.00 ft.
LOCATION. --Lat 40°19'11", long 74°06'56" referenced to North American Datum of 1983, Colts Neck Township, Monmouth County, NJ, Hydrologic Unit 02030104, on left bank 50 ft upstream from spillway at Swimming River Reservoir, 1,000 ft upstream of bridge on Swimming River Road, 3.3 mi southwest of Red Bank, and 4.8 mi upstream from mouth.
DRAINAGE AREA. --49.2 mi2.
PERIOD OF RECORD.--August 1922 to current year.
GAGE. --Water-stage recorder above concrete dam. Datum of gage is 30.00 ft above NGVD of 1929. Prior to Jan 19, 1962, at site 800 ft upstream at datum 17.67 ft lower. Jan 19 to Mar 30, 1962, nonrecording gage, 700 ft upstream at datum 13.87 ft lower.
EXTREMES OUTSIDE PERIOD OF RECORD. --Flood of July 1919 reached a stage of 7.84 ft (site and datum then in use; from floodmark), discharge, approximately 11,800 ft3/s.
COOPERATION. --Funding for this gage is provided by the New Jersey Department of Environmental Protection, and the U.S. Geological Survey.
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Value Aug 2