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:
Lat 41°01'06", long 74°00'04"
referenced to North American Datum of 1983, Old Tappan Borough, Bergen
County, NJ, Hydrologic Unit 02030103, at dam on Hackensack River, 0.5
mi north of Old Tappan, and 3.0 mi upstream from gaging station
Hackensack River at Rivervale, NJ (01377000).
PERIOD OF RECORD.--
From October 1966 to October 2010, month-end
elevation and contents were provided by United Water New Jersey.
Continuous-record reservoir station, 2011 to current year.
WDR NJ-88-1: Capacity, WDR NJ-99-1: 1998
Water-stage recorder with telemetry. Datum of gage is
NGVD of 1929.
United Water New Jersey.
Reservoir is formed by earthfill dam, completed in
1966. Capacity, 3,853,000,000 gal, elevation, 55.00 ft at top of
Bascule gates. Flow regulated by four Bascule gates and one sluice
gate. Water is released for diversion at New Milford and Oradell
Reservoir at Haworth by United Water New Jersey for municipal water
supply. 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, 4,120,000,000
gal, Aug 28, 2011, gage height 55.73 ft; minimum contents 1,240,000,000
gal, Jan 10, 2011, gage height 46.35 ft.