Largest lakes & reservoirs in Maryland 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 8 articles we have published for Maryland lakes.
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Below are lakes within USA > US Mid-Atlantic Region > Maryland > Compared by water volume. This list does not represent all lakes in Maryland, only the 8 Maryland lake articles we have published on the LakeLubbers website.
Lake name  |
Water vol. in ac-ft |
Lake description |
|---|---|---|
| Liberty Reservoir, MD (Central Maryland, Maryland, US Mid-Atlantic Region, USA) |
132,000 ac-ft | (Also known as Liberty Lake) Liberty Reservoir, also known as Liberty Lake, is located in the Patapsco region of the Chesapeake Bay watershed within Maryland’s Baltimore suburbs.… |
| Jennings Randolph Lake, MD/WV (Maryland, Potomac Highlands Region, WV, US Mid-Atlantic Region, US South Region, USA, West Virginia, Western Maryland) |
130,900 ac-ft | (Also known as Jennings Randolph Reservoir, Bloomington Lake) Jennings Randolph Lake is nestled in a scenic valley along the North Branch Potomac River. This portion of the Potomac creates the county and state bo… |
| Deep Creek Lake, MD (Maryland, US Mid-Atlantic Region, USA, Western Maryland) |
106,000 ac-ft | Deep Creek Lake is the largest inland body of water in Maryland, covering about 3,900 acres in the Allegheny Mountains of western Maryland. Since its… |
| Prettyboy Reservoir, MD (Central Maryland, Maryland, US Mid-Atlantic Region, USA) |
90,100 ac-ft | Prettyboy Reservoir spreads out over 1,500 acres in northern Baltimore County, Maryland. It is named after Prettyboy Creek, which is a located in a se… |
| Loch Raven Reservoir, MD (Central Maryland, Maryland, US Mid-Atlantic Region, USA) |
72,721 ac-ft | The Loch Raven Reservoir is located just a few miles north of Baltimore. Unspoiled and surrounded by forests and hiking trails, it has long provided M… |
| Savage River Reservoir, MD (Maryland, US Mid-Atlantic Region, USA, Western Maryland) |
20,000 ac-ft | Fresh, crystal clear mountain water makes Savage River Reservoir a beautiful destination in northwestern Maryland. Located in a canyon of the Savage R… |
| Little Seneca Lake, MD (Capital Region, MD, Maryland, US Mid-Atlantic Region, USA) |
13,402 ac-ft | Little Seneca Lake, located near Boyds, Maryland, is the focal point of the Black Hill Regional Park and covers nearly 1/3 of its acreage. It lies in… |
| Lake Needwood & Lake Frank (Capital Region, MD, Maryland, US Mid-Atlantic Region, USA) |
649 ac-ft | (Also known as Needwood Reservoir, Lake Bernard Frank, Bernard Frank Reservoir) Lake Needwood and its little neighbor, Lake Bernard Frank, offer a quiet respite from the busy, noisy metropolitan Washington DC landscape. The little… |