Click
to
hide
Water-Year
Summary
instructions
and
information
- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
01376950 LAKE TAPPAN AT OLD TAPPAN, NJ
LOCATION - 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).
DRAINAGE AREA - 49 mi².
REVISIONS HISTORY - WDR NJ-88-1: Capacity, WDR NJ-99-1: 1998 (elevation, contents).
SURFACE-WATER RECORDS
PERIOD OF RECORD - From October 1966 to October 2010, month-end elevation and contents were provided by Veolia Water (formerly SUEZ Water; formerly United Water New Jersey). Continuous-record reservoir station, 2011 to current year.
GAGE - Water-stage recorder with telemetry. Datum of gage is NGVD of 1929.
REMARKS - 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 Veolia Water 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, 4,207,000,000 gal, Sept 1, 2021, gage height 55.97 ft; minimum contents 1,240,000,000 gal, Jan 10, 2011, gage height 46.35 ft.
