Largest lakes & reservoirs in Pennsylvania 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 40 articles we have published for Pennsylvania lakes.
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Below are lakes within USA > US Mid-Atlantic Region > Pennsylvania > Compared by water volume. This list does not represent all lakes in Pennsylvania, only the 40 Pennsylvania lake articles we have published on the LakeLubbers website.
Lake name ![]() |
Water vol. in ac-ft ![]() |
Lake description |
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Canadohta Lake, PA (Great Lakes Region, PA, Pennsylvania, US Mid-Atlantic Region, USA) |
3,138 ac-ft | Canadohta Lake is one of the largest natural lakes in Pennsylvania. Its tree-lined shores and spring-fed waters are located in the Keystone State’s Gr … |
Big Boulder Lake, PA (Northeastern Mountains Region, PA, Pennsylvania, US Mid-Atlantic Region, USA) |
1,971 ac-ft | In winter visitors to Big Boulder Lake can look across the frozen water to the ski slopes beyond. In spring and summer mountain laurel dots the shore, … |
Lake Naomi, PA (Northeastern Mountains Region, PA, Pennsylvania, US Mid-Atlantic Region, USA) |
1,492 ac-ft | Lake Naomi, located in the Pocono Mountains of northeastern Pennsylvania, offers residents and visitors alike four seasons of recreation. During every … |
Lake Stoneycreek, PA (Pennsylvania, Pittsburgh & Countryside Region, PA, US Mid-Atlantic Region, USA) |
1,320 ac-ft | Tucked away in the Allegheny Mountains of south west Pennsylvania, Lake Stoneycreek is a private mountain jewel. Close enough to enjoy everything the … |