Newest reservoirs in Washington
The year that a reservoir was first filled to the reservoir’s normal elevation – or the year that a natural lake was first dammed – is the determining factor in the age of the body of water. A large reservoir can take more than a year to fill after its dam is first closed. You can find many of the the world’s newest reservoirs on LakeLubbers in the comparison table below. Many of the world’s oldest reservoirs appear on the last page of that list. Note: For some lakes, the completion year data is unknown, so you may see fewer lakes than the total 58 articles we have published for Washington lakes.Thinking about booking a Washington lake vacation home rental, cabin or hotel?
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Below are lakes within USA > US West Region > Washington > Compared by newest (youngest) reservoirs and the year it was completed. This list does not represent all lakes in Washington, only the 58 Washington lake articles we have published on the LakeLubbers website.
Lake name  |
Completion year |
Lake description |
|---|---|---|
| Lake Roosevelt, WA (Northeast Washington, US West Region, USA, Washington) |
1942 | 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 … |
| Whatcom Lake, WA (Northwest Washington & Islands, WA, US West Region, USA, Washington) |
1937 | 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 … |
| Cle Elum Lake, WA (North Central Washington, US West Region, USA, Washington) |
1933 | 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 Cushman, WA (Olympic Peninsula & Pacific Coast Region, WA, US West Region, USA, Washington) |
1930 | 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 … |
| Waitts Lake, WA (Northeast Washington, US West Region, USA, Washington) |
1928 | Set against the tree-clad mountain backdrop of Northeast Washington, Waitts Lake is a beautiful destination for the whole family. Surrounded by nation … |
| Lake Osoyoos, WA / Canada (British Columbia, Canada, Canada, North Central Washington, US West Region, USA, Washington) |
1927 | 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 … |
| Keechelus Lake, WA (North Central Washington, US West Region, USA, Washington) |
1917 | Also known as Lake Keechelus, Keechelus Reservoir It is a picture postcard – snow capped mountains mirrored back in clean, clear, mountain water. Set against the backdrop of Washington’s Cascade Mount … |
| Lake Spokane, WA (Northeast Washington, US West Region, USA, Washington) |
1915 | 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 … |
| Kachess Lake, WA (North Central Washington, US West Region, USA, Washington) |
1912 | “Kachess” means “more fish,” a name that aptly describes Lake Kachess in North Central region of Washington. The lake is full of fish, and anglers can … |
| Bumping Lake, WA (South Central Washington, US West Region, USA, Washington) |
1910 | 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 … |