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 |
|---|---|---|
| Silver Lake Cowlitz County, WA (Southwest Washington, US West Region, USA, Washington) |
1971 | Silver Lake is a shallow 3,000-acre wetland lake located in southwest Washington. Formed by an early eruption of Mount St. Helens, which permanently d … |
| Mayfield Lake (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
1963 | 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 Entiat, WA (North Central Washington, US West Region, USA, Washington) |
1962 | Also known as Rocky Reach Reservoir No trip to the north central part of Washington would be complete without a visit to Lake Entiat and the Rocky Reach Dam. Lake Entiat is a 9,100 acre … |
| Lake Sacajawea, WA (South Central Washington, US West Region, USA, Washington) |
1962 | Named after the Shoshone woman, Sacajawea, who was a member of the Lewis and Clark expedition, Lake Sacajawea is located in south-central Washington. … |
| Lake Celilo, OR/WA (Mt. Hood-The Gorge Region, OR, Oregon, Southwest Washington, US West Region, USA, Washington) |
1957 | Also known as Dalles Lock and Dam Beautiful and serene Lake Celilo is located off of I-84 about an hour and a half east of Portland, Oregon. Lake Celilo stretches 24 miles long and str … |
| Lake Wallula, OR/WA (Eastern Oregon, Oregon, South Central Washington, US West Region, USA, Washington) |
1954 | Lake Wallula, a 64 mile long reservoir, is a wide open glassy lake that extends from northeastern Oregon to southeastern Washington. Lake Wallula rece … |
| Banks Lake, WA (North Central Washington, US West Region, USA, Washington) |
1951 | 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 … |
| Quincy Lakes (North Central Washington, US West Region, USA, Washington) |
1950 | Also known as Quincy Lakes Wildlife Area, Quincy Lake, Evergreen Reservoir, Burke Lake, Stan Coffin Lake, Ancient Lakes A surreal landscape greets visitors to north-central Washington’s Quincy Lakes Wildlife Area. Pothole lakes filled by water seeping through porous lav … |
| Potholes Reservoir, WA (North Central Washington, US West Region, USA, Washington) |
1949 | 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 … |
| Ross Lake (British Columbia, Canada, Canada, North Central Washington, US West Region, USA, Washington) |
1949 | 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 … |
| Billy Clapp Lake, WA (North Central Washington, US West Region, USA, Washington) |
1948 | Located in north central Washington, two miles northeast of Stratford, Billy Clapp Lake offers visitors year round access to its deep blue waters. Bil … |
| Alder Lake (Southwest Washington, US West Region, USA, Washington) |
1945 | 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 … |