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 analysis.

 

SURFACE-WATER RECORDS
LOCATION.--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.
DRAINAGE AREA.--19.4 mi².
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 SUEZ Water. Annual minimum, October 2007 to current year.
REVISIONS HISTORY.--WDR NJ-88-1: Capacity, WDR NJ-99-1: 1998 (elevation, contents).
GAGE.--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 Jersey).
COOPERATION.--SUEZ Water.
REMARKS.--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 SUEZ water, 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 (now SUEZ water), 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, 2014.