Largest lakes & reservoirs in Washington County, RI 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 4 articles we have published for Washington County, RI lakes.
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Below are lakes within USA > US New England Region > Rhode Island > Washington County, RI > Compared by water volume. This list does not represent all lakes in Washington County, RI, only the 4 Washington County, RI lake articles we have published on the LakeLubbers website.
Lake name  |
Water vol. in ac-ft |
Lake description |
|---|---|---|
| Ninigret Pond (Rhode Island, US New England Region, USA, Washington County, RI) |
6,413 ac-ft | (Also known as Charlestown Pond) Ninigret Pond is a coastal lagoon located in the town of Charlestown in Rhode Island’s Washington County. With a surface area of 1,539 acres, Ninigret… |
| Beach Pond, CT/RI (Connecticut, Mystic Country Region, CT, Rhode Island, US New England Region, USA, Washington County, RI) |
4,100 ac-ft | Beach Pond’s 459 acres span the south-central Rhode Island-Connecticut state line near the communities of Exeter and Voluntown — the wooded shoreline… |
| Green Hill Pond (Rhode Island, US New England Region, USA, Washington County, RI) |
1,170 ac-ft | Green Hill Pond is part of the Salt Ponds Region along Rhode Island’s southern shore. The pond is located between the communities of South Kingstown a… |