Funding for this site is provided by:
SURFACE-WATER RECORDS
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 (County Route 50), 3.3 mi southwest of
Red Bank, and 4.8 mi upstream from mouth.
DRAINAGE AREA.--49.2 mi
2.
PERIOD OF RECORD.--Continuous-record discharge station, August
1922 to current year.
REVISED RECORDS.--WSP 891: 1939. WDR NJ-83-1: Drainage area. WDR
NJ-90-1: 1989
GAGE.--Water-stage recorder with telemetry 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,
non-recording gage, 700 ft upstream at datum 13.87 ft lower.
REMARKS.--Records fair, except for estimated discharges and
discharges less than 5 ft
3/s, which are poor. Records given
herein represent flow over spillway and flow or leakage through blowoff
gates. Flow regulated by diversions from Swimming River Reservoir for
municipal supply. Reservoir used for storage and water diversion by New
Jersey-American Water Company. Reservoir enlarged and dam raised in
1962. Discharges above 1,100 ft
3/s from rating curve
extension on basis of weir formula.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 8,910
ft
3/s, from rating curve extended above 1,100
ft
3/s on basis of weir formula, Oct 27, 1943, gage height,
8.96 ft, site and datum then in use; minimum discharge, 0.00
ft
3/s, many days.
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 ft
3/s.
WATER-QUALITY RECORDS
PERIOD OF RECORD.--Water years 1923-24, 1952, 1960-72, 1974-81,
2007.
Peak
Flood Chart
National Weather Service flood stage for
this gage is 7 ft.
