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 Chelan, WA (North Central Washington, US West Region, USA, Washington) |
1,486 ft | From the Salish Indian word for “deep notch”, Lake Chelan is the third deepest lake in the United States with a maximum depth of almost 1500 feet. Lak… |
| Lake Crescent, WA (Olympic Peninsula & Pacific Coast Region, WA, US West Region, USA, Washington) |
624 ft | Also known as Crescent Lake Lake Crescent is a majestic glacial lake located at the northern tip of the Olympic National Forest in Clallam County, Washington. Glaciers during the… |
| Ross Lake (British Columbia, Canada, Canada, North Central Washington, US West Region, USA, Washington) |
400 ft | Also known as Ross Reservoir Spectacular Ross Lake is one of the seldom seen gems in north-central Washington. This fantastic 22-mile long reservoir covers 11,680 acres along the… |
| Lake Roosevelt, WA (Northeast Washington, US West Region, USA, Washington) |
400 ft | Also known as Lake Franklin D. Roosevelt Lake Roosevelt, located approximately 90 miles northwest of Spokane, Washington, covers 82,000 acres with a shoreline of 630 miles. Lake Roosevelt, al… |
| Rock Lake (Northeast Washington, US West Region, USA, Washington) |
375 ft | Deep, dark and mysterious describes Northeast Washington’s Rock Lake. Largest and deepest of the many lakes in the ‘Channeled Scablands’, Rock lake co… |
| Cle Elum Lake, WA (North Central Washington, US West Region, USA, Washington) |
333 ft | Also known as Lake Cle Elum Providing much needed water to the dry, fertile soil of north-central Washington, Cle Elum Lake is the largest of four irrigation storage reservoirs i… |
| Lake Ozette, WA (Olympic Peninsula & Pacific Coast Region, WA, US West Region, USA, Washington) |
331 ft | Also known as Ozette Lake Nestled in dense forest just a few miles from the Pacific Coast, Lake Ozette sits snuggled into Washington’s Olympic Peninsula tourism region, on the… |
| Whatcom Lake, WA (Northwest Washington & Islands, WA, US West Region, USA, Washington) |
330 ft | Also known as Lake Whatcom Whatcom Lake is a 5,000-acre natural lake surrounded by mountainous terrain located in Whatcom County, Washington. Whatcom is from a Nooksack Indian w… |
| Alder Lake (Southwest Washington, US West Region, USA, Washington) |
290 ft | Also known as Alder Reservoir Vacationers planning to visit Mount Rainer need to fit beautiful Alder Lake into their plans. This reservoir in the Southwest Region of Washington off… |
| Lake Cushman, WA (Olympic Peninsula & Pacific Coast Region, WA, US West Region, USA, Washington) |
260 ft | Nestled in the foothills of the majestic Olympic Mountains, Lake Cushman is known for its clear, blue water and alpine beauty. With 23 miles of shorel… |
| Lake Wenatchee, WA (North Central Washington, US West Region, USA, Washington) |
244 ft | Lake Wenatchee is a high mountain lake located in the Wenatchee National Forest in the Cascade Mountains of Washington state. Fed by the Little Wenatc… |
| Lake Quinault, WA (Olympic Peninsula & Pacific Coast Region, WA, US West Region, USA, Washington) |
240 ft | Also known as Quinault Lake Located in northwest Washington’s Olympic Peninsula tourism region, Lake Quinault is a clear, deep lake lying just west of the Olympic Mountains. Twel… |