Largest lakes & reservoirs in New Jersey by water volume
The estimated volume of water that a lake contains is measured at the lake’s normal elevation. By this measure, the world’s largest freshwater lake is Siberia’s Lake Baikal.Water Volume can be measured in acre-feet, in cubic miles, or in cubic kilometers. One acre-foot is the amount of water needed to cover one acre (43,560 square feet) to a depth of one foot. One cubic mile equals 3,379,200 acre-feet. One cubic kilometer equals 810,713 acre-feet. 1 acre-foot is equal to 325,851 US gallons. Siberia’s Lake Baikal contains about 6,276,367,740,000,000 gallons of freshwater – nearly 1 million gallons for every living person on earth.
The other – and more widely used – measure of a lake’s size is the lake’s surface acreage. By that measure, the world’s largest freshwater lake is North America’s Lake Superior.
Note: In the United States, an acre foot is a unit of volume used to refer to large-scale bodies of water. It is defined by the volume of water needed to cover 1 acre of surface area to a depth of 1 foot.
You can find many of the the world’s largest lakes (by water volume) on LakeLubbers. Note: For some lakes, the water volume data is unknown or does not apply, so you may see fewer lakes than the total 21 articles we have published for New Jersey lakes.
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Below are lakes within USA > US Mid-Atlantic Region > New Jersey > Compared by water volume. This list does not represent all lakes in New Jersey, only the 21 New Jersey lake articles we have published on the LakeLubbers website.
Lake name  |
Water vol. in ac-ft |
Lake description |
|---|---|---|
| Round Valley Reservoir, NJ (New Jersey, Skylands Region, NJ, US Mid-Atlantic Region, USA) |
168,788 ac-ft | Round Valley Reservoir spans 2,350 acres in Hunterdon County, New Jersey. The reservoir fills the valley formed by the ring-shaped Cushetunk Mountain,… |
| Lake Hopatcong, NJ (New Jersey, Skylands Region, NJ, US Mid-Atlantic Region, USA) |
48,209 ac-ft | Lake Hopatcong is the largest lake in New Jersey, at about nine miles long with 45 miles of shoreline and covering 2,560 acres. Only 45 miles from New… |
| Merrill Creek Reservoir, NJ (New Jersey, Skylands Region, NJ, US Mid-Atlantic Region, USA) |
48,075 ac-ft | Merrill Creek Reservoir, located in Warren County, New Jersey, is a 650-acre man-made lake completed in 1988. The reservoir project took 13 years of p… |
| Spruce Run Reservoir, NJ (New Jersey, Skylands Region, NJ, US Mid-Atlantic Region, USA) |
33,758 ac-ft | Spruce Run Reservoir is one of the oldest reservoirs in the state of New Jersey. Constructed in the 1960s to meet an increasing need for water supplie… |
| Manasquan Reservoir, NJ (New Jersey, Shore Region, NJ, US Mid-Atlantic Region, USA) |
14,470 ac-ft | (Also known as Manasquan County Reservoir) Manasquan Reservoir is located in Monmouth County, New Jersey. Artifacts found near the reservoir indicate that its land was once occupied by the Lena… |
| Lake Tappan, NJ/NY (Gateway Region, NJ, Hudson Valley Region, NY, New Jersey, New York, US Mid-Atlantic Region, USA) |
10,741 ac-ft | (Also known as Tappan Lake, Lake Tappan Reservoir, Tappan Reservoir) Lake Tappan is one of a series of reservoirs that was created to deliver drinking water to the huge population of the New York City metro area. The la… |
| Lake Owassa, NJ (New Jersey, Skylands Region, NJ, US Mid-Atlantic Region, USA) |
3,437 ac-ft | A privately-owned association lake, Lake Owassa is located in Sussex County in the Culvers Gap Area of the Skyland Region. The lake is only 275-acres… |
| Lake Carnegie (Delaware River Region, NJ, New Jersey, US Mid-Atlantic Region, USA) |
1,906 ac-ft | (Also known as Carnegie Lake) Although steel magnate and philanthropist Andrew Carnegie is remembered for his library donations, one of his lesser-known gifts to society is Lake Ca… |
| Oxford Furnace Lake, NJ (New Jersey, Skylands Region, NJ, US Mid-Atlantic Region, USA) |
1,440 ac-ft | (Also known as Furnace Brook Watershed #2 Dam) What was once built for practical purposes of flood and erosion control is now a quiet lake area known as Oxford Furnace Lake in Warren County, New Je… |
| Lake Aeroflex (New Jersey, Skylands Region, NJ, US Mid-Atlantic Region, USA) |
360 ac-ft | (Also known as New Wawayanda Lake) Tucked away within New Jersey’s Skylands region, Lake Aeroflex is the crown jewel of the Kittatinny Valley State Park. Sometimes called New Wawayanda… |