{{For|the lake in Ohio|Tappan Lake}} {{Use American English|date=July 2025}} {{Use mdy dates|date=February 2025}} {{Infobox body of water | name = Lake Tappan | image = Lake Tappan.jpg | caption = | image_bathymetry = | caption_bathymetry = | location = Bergen County, New Jersey and Rockland County, New York, United States | coords = {{coord|41.037672|N|73.990000|W|region:US_type:waterbody|display=inline,title}} | lake_type = reservoir | inflow = Hackensack River | outflow = | catchment = | basin_countries = Newark Basin<br>United States | length = | width = | area = {{convert|1255|acre|km2|abbr=on}} | depth = | max-depth = | volume = {{convert|3500000000|USgal|m3|abbr=on}} | residence_time = | shore = | elevation = {{convert|56|ft|m|abbr=on}};<ref name=gnis/> <br/> {{convert|55|ft|m|abbr=on}}<ref name="Leiby_1969"/>{{rp|222}} | islands = | cities = | frozen = <!-- Map --> | pushpin_map = New Jersey#USA | pushpin_label_position = | pushpin_map_alt = Location of Lake Tappan in New Jersey, USA. | pushpin_map_caption = <!-- Below --> | website = | reference = <ref name=gnis>{{Gnis|882028}}</ref> }}
'''Lake Tappan''' is a reservoir impounded by the Tappan Dam on the Hackensack River, straddling the border between the U.S. states of New Jersey and New York.<ref name="Leiby_1969">{{Citation |last=Leiby |first=Adrian C. |others=In collaboration with Nancy Wichman |year=1969 |title=The Hackensack Water Company, 1869-1969 |publisher=Bergen County Historical Society |oclc=13847 |asin=B0006C01Q0 |postscript=.}}</ref>{{rp|221–223}} Within New Jersey, the lake traverses the border separating the municipalities of River Vale and Old Tappan in Bergen County, while extending northward across the New York state line into the town of Orangetown in Rockand County. The reservoir was formed in 1967, flooding areas that included the former CAPROC Field Civil Air Patrol airstrip.<ref>{{cite news|last=Knight|first=Robert|title=June 26 Hearing on Pearl River Housing Project|url=http://www.rocklandtimes.com/2012/06/14/june-26-hearing-on-pearl-river-housing-project/|accessdate=9 January 2013|newspaper=Rockland County Times|date=June 14, 2012}}</ref>
The Lake Tappan reservoir covers 1,255 acres (5.1 km<sup>2</sup>),<ref name="Leiby_1969"/>{{rp|222}} the majority of its area being within New Jersey, and it contains {{convert|3.5|e9USgal|m3}} of water, with up to {{convert|12|to|13|e6USgal|m3}} released downstream daily into the Oradell Reservoir, which lies entirely within Bergen County in New Jersey. The passage of this water between reservoirs can occur in as rapidly as two to three hours. Lake Tappan has an average depth of 21' with a maximum depth of 43'.<ref>{{Cite web|url=https://www.lakelubbers.com/lake-tappan-507/|title = Lake Tappan Vacation Info}}</ref>
On March 11, 2003, New Jersey Governor Jim McGreevey visited the reservoir and proposed protecting it as well as the nearby Woodcliff Lake Reservoir and their tributaries with Category 1 water purity status.<ref>{{cite web |url=http://www.waterindustry.org/New%20Projects/new-jersey-2.htm |title=McGrevey seeks purity standards for reserviors |access-date=2004-07-15 |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303224014/http://www.waterindustry.org/New%20Projects/new-jersey-2.htm |url-status=dead }}</ref>
The reservoir is owned by Suez North America, a private utility.
Lake Tappan is a local fishing spot as well, serving as a habitat for bluegill, bass, perch, catfish and carp.
==References== {{reflist}}
==External links== *{{Gnis|882028}}
{{Passaic River}} {{authority control}}
Tappan Tappan Category:Hackensack River Category:Protected areas of Rockland County, New York Category:Protected areas of Bergen County, New Jersey Category:Old Tappan, New Jersey Category:United Water Tappan Tappan
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