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°00'46", long 74°02'57"
referenced to North American Datum of 1983, Hillsdale Borough, Bergen
County, NJ, Hydrologic Unit 02030103, at Woodcliff Lake Dam on Pascack
Brook, 0.7 mi north of Hillsdale, and 1.5 mi north of Westwood.
PERIOD OF RECORD.--
Lake elevation and contents, water years 1929
to current year. Annual maximum, water years 1998 to current year.
Prior to October 2007, month-end elevation and contents provided by
United Water New Jersey. Annual minimum, October 2007 to current
WDR NJ-88-1: Capacity, WDR NJ-99-1: 1998
Water-stage recorder with telemetry and crest-stage gage.
Datum of gage is 0.00 ft above NGVD of 1929 (levels by United Water New
United Water New Jersey.
Reservoir is formed by earthfill dam, completed about
1905. The dam was modified in 1984, which increased capacity,
871,000,000 gal, elevation, 95.00 ft at top of Bascule gates. Flow is
regulated by two Bascule gates 85-ft long and 6-ft high each and one
24-inch ball valve. Water is released for diversion at New Milford
(diversion discontinued May 1990) and Oradell Reservoir at Haworth by
United Water New Jersey, for municipal 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, 973,000,000
gal, Apr 16, 2007, gage height 96.8 ft; Minimum contents recorded,
46,800,000 gal, Sep 4, 2014, gage height, 74.05 ft; minimum contents
observed from survey provided by Untied Water New Jersey, 26,000,000
gal, Aug 29, 2014, gage height, 72.50 ft, although contents may have
been lower during period of dam construction Aug 27 – Sep 4,