Largest lakes & reservoirs in Seattle & Puget Sound Region, WA 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 14 articles we have published for Seattle & Puget Sound Region, WA lakes.
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Below are lakes within USA > US West Region > Washington > Seattle & Puget Sound Region, WA > Compared by water volume. This list does not represent all lakes in Seattle & Puget Sound Region, WA, only the 14 Seattle & Puget Sound Region, WA lake articles we have published on the LakeLubbers website.
Lake name  |
Water vol. in ac-ft |
Lake description |
|---|---|---|
| Lake Washington, WA (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
2,350,000 ac-ft | Lake Washington has the distinction of being the second largest natural lake in the state of Washington. This glacial lake is long and narrow, a “ribb … |
| Riffe Lake (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
1,686,000 ac-ft | (Also known as Riffe Reservoir, Mossyrock Lake, Davisson Lake) Riffe Lake by any other name would still be a fantastic recreational spot. The name confusion for this man-made reservoir in the Seattle and Puget Sou … |
| Lake Sammamish, WA (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
283,860 ac-ft | At just under 5,000 acres, Lake Sammamish is one of the major recreational lakes in the state. The lake provides activities for fishermen, boaters, je … |
| American Lake, WA (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
60,000 ac-ft | Less than three miles inland from Puget Sound, American Lake is one of the lesser known vacation destinations in Washington’s Seattle-King County Regi … |
| 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 … |
| Wildcat Lake, WA (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
2,160 ac-ft | Wildcat Lake can be found in the state of Washington’s Seattle and Puget Sound tourism region. It has a surface area of 120 acres and an average depth … |
| Horseshoe Lake, WA (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
480 ac-ft | One of three lakes in Washington state of the same name, Kitsap County’s Horseshoe Lake is the tiniest – and arguably the most beautiful – of them all … |