Occasionally the reservoir levels appear to be several tenths of a foot too low due to possible drawdown caused by use of water supply intakes at certain levels.

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Continuous data

1 data types available - data from 2007-10-01 to 2026-08-17

Daily data

1 data types available - data from 1997-10-01 to 2026-08-16

Field measurements

2 data types available - data from 1988-11-03 to 2026-08-14

Discrete sample data

0 observed properties (data types) available

Statistical tables for select daily data types

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Location details and information

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Operated in cooperation with:

US Army Corps of Engineers - New York District

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	01386990	n/a
Location name	Wanaque Reservoir at Wanaque NJ	n/a
Site type	Lake, Reservoir, Impoundment	LK
Decimal latitude (WGS84)	41.045	n/a
Decimal longitude (WGS84)	-74.2952777777778	n/a
Latitude-longitude method	Interpolated from MAP.	M
Latitude-longitude accuracy	Accurate to + or - 1 sec.	S
District	New Jersey	34
State	New Jersey	34
County	Passaic County	031
Country	United States of America	n/a
Altitude of gage/land surface	0	n/a
Method altitude determined	Level or other surveyed method.	L
Altitude accuracy	0.01 feet	n/a
Altitude datum	National Geodetic Vertical Datum of 1929	NGVD29
Subbasin hydrologic unit	Hackensack-Passaic	02030103
Drainage basin		n/a
Date of first construction		n/a
Drainage area	90.4 square miles	n/a
Contributing drainage area		n/a
Time zone abbreviation	EST	n/a
Site honors Daylight Saving Time	Y	n/a
National aquifer		n/a
Local aquifer		n/a
Local aquifer type		n/a
Well depth		n/a
Hole depth		n/a
Source of depth data		n/a

Monitoring location Wanaque Reservoir at Wanaque NJ - USGS-01386990