Largest lakes & reservoirs in Washington 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 58 articles we have published for Washington lakes.
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Below are lakes within USA > US West Region > Washington > Compared by water volume. This list does not represent all lakes in Washington, only the 58 Washington lake articles we have published on the LakeLubbers website.
Lake name  |
Water vol. in ac-ft |
Lake description |
|---|---|---|
| Deer Lake, WA (Northeast Washington, US West Region, USA, Washington) |
57,000 ac-ft | Deer Lake, located in Stevens County, Washington, is a spring-fed and snow-fed lake with approximately a 1,150-acre surface in the Colville River wate … |
| Loon Lake, WA (Northeast Washington, US West Region, USA, Washington) |
50,600 ac-ft | Crystal clear water from a natural spring fills Loon Lake located in Stevens County in northeastern Washington. In a beautiful mountain setting surrou … |
| Mason Lake, WA (Olympic Peninsula & Pacific Coast Region, WA, US West Region, USA, Washington) |
48,000 ac-ft | Mason Lake is a natural freshwater lake with an elongated shape located in Mason County, part of Washington state’s Olympic Peninsula tourism region. … |
| Curlew Lake, WA (Northeast Washington, US West Region, USA, Washington) |
39,519 ac-ft | Nestled in a valley with breathtaking views of Colville National Forest, Ferry National Forest and mountain ranges, Curlew Lake is located 4.8 miles n … |
| Lake Cavanaugh, WA (Northwest Washington & Islands, WA, US West Region, USA, Washington) |
37,294 ac-ft | The snowy peaks of the Northern Cascades complement the multitude of evergreens that surround 844-acre Lake Cavanaugh. Located in Skagit County in Nor … |
| Bumping Lake, WA (South Central Washington, US West Region, USA, Washington) |
33,700 ac-ft | (Also known as Bumping Reservoir) Lying near the shadow of Mt. Rainier, Bumping Lake is the first of six reservoirs owned and operated by the Bureau of Reclamation. Part of the Yakima … |
| Duck Lake (Olympic Peninsula & Pacific Coast Region, WA, US West Region, USA, Washington) |
30,000 ac-ft | Duck Lake is an unlikely candidate for one of the best fishing lakes in southwestern Washington but holds its own with the best of contenders! Located … |
| Newman Lake, WA (Northeast Washington, US West Region, USA, Washington) |
22,800 ac-ft | Newman Lake is a natural 1,200-acre lake located about 20 miles northeast of Spokane, Washington. Although Newman Lake is relatively small compared to … |
| Diamond Lake, WA (Northeast Washington, US West Region, USA, Washington) |
21,600 ac-ft | Situated in the heart Washington’s Pend Oreille County, Diamond Lake is one of many sparkling bodies of water belonging to the Evergreen State. Centur … |
| Billy Clapp Lake, WA (North Central Washington, US West Region, USA, Washington) |
21,200 ac-ft | Located in north central Washington, two miles northeast of Stratford, Billy Clapp Lake offers visitors year round access to its deep blue waters. Bil … |
| Lake Union (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
20,000 ac-ft | (Also known as Meman Hartshu, Small Lake, Tenass Chuck, Little Water) Surrounded by four vibrant urban neighborhoods, Lake Union sits in the heart of Seattle, Washington. From orcas playing in Puget Sound to sea kayakers … |
| Waitts Lake, WA (Northeast Washington, US West Region, USA, Washington) |
18,880 ac-ft | Set against the tree-clad mountain backdrop of Northeast Washington, Waitts Lake is a beautiful destination for the whole family. Surrounded by nation … |