Deepest lakes & reservoirs in Washington by maximum depth (ft)
The estimated greatest depth of the water in a lake can be measured at the lake’s normal elevation. If the water volume and surface area of a lake are known, an estimate of the lake’s average depth can be calculated:Water volume ÷ Surface Area = Average Depth
Example: 1,000,000 acre-feet ÷ 20,000 acres = 50 feet average depth.
You can find many of the the world’s deepest lakes on LakeLubbers. If you sort the list, you will find the (maximum depth of) the shallowest lakes in our database. Note: For some lakes, lake depth data is unknown, so this table may display 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 maximum depth in feet. This list does not represent all lakes in Washington, only the 58 Washington lake articles we have published on the LakeLubbers website.
Lake name | Max depth in feet | Lake description |
---|---|---|
Lake Washington, WA (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
214 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 … |
Lake Osoyoos, WA / Canada (British Columbia, Canada, Canada, North Central Washington, US West Region, USA, Washington) |
208 ft | Also known as Osoyoos Lake Lake Osoyoos spans more than 5,700 acres and straddles the border of British Columbia, Canada and Washington state in the United States. The Okanagan … |
Coldwater Lake, WA (Southwest Washington, US West Region, USA, Washington) |
190 ft | Today Coldwater Lake is a peaceful, scenic 750-acre lake, but the violence of Mount St. Helens created the lake in 1980. On May 18, 1980, a 5.1 magnit … |
Mayfield Lake (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
190 ft | Mayfield Lake is cradled in the foothills of the Cascades in Lewis County, Washington. This 2,200-acre reservoir is conveniently located close to Moun … |
Lake Spokane, WA (Northeast Washington, US West Region, USA, Washington) |
180 ft | Also known as Long Lake Lake Spokane, a 24 mile long reservoir, is so named because of its close proximity to Spokane, Washington. However, some people call it Long Lake, aft … |
Banks Lake, WA (North Central Washington, US West Region, USA, Washington) |
177 ft | Banks Lake is a 27 mile equalizing reservoir and part of the Columbia Basin Project, a major water resource project to provide irrigation water to fer … |
Potholes Reservoir, WA (North Central Washington, US West Region, USA, Washington) |
142 ft | Potholes Reservoir was formed by the building of the O’Sullivan Dam which is one of the largest earthfill dams in the United States. The name “pothole … |
Curlew Lake, WA (Northeast Washington, US West Region, USA, Washington) |
130 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 … |
Williams Lake WA (Northeast Washington, US West Region, USA, Washington) |
120 ft | Delighting anglers in eastern Washington, Williams Lake really serves up the trout! The long and narrow 320-acre lake is located less than 30 miles fr … |
Bumping Lake, WA (South Central Washington, US West Region, USA, Washington) |
117 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 … |
Lake Sammamish, WA (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
105 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 … |
Loon Lake, WA (Northeast Washington, US West Region, USA, Washington) |
100 ft | Crystal clear water from a natural spring fills Loon Lake located in Stevens County in northeastern Washington. In a beautiful mountain setting surrou … |