Largest lakes & reservoirs in Seattle & Puget Sound Region, WA by shoreline length
The length of the exterior shoreline around a lake is measured at the lake’s normal elevation. The shoreline length can be considerably shorter or longer when lake water levels are lower or higher than normal. A lake with many coves has a much longer shoreline than a lake of similar surface area that is nearly circular in shape.When known, the shoreline miles that we report in our statistics include only the lake’s exterior shoreline, and exclude the shorelines of islands located within a lake’s boundaries. In lakes with many islands, those islands’ combined shorelines may exceed a lake’s exterior shoreline.
You can find many of the world’s longest-shoreline lakes on LakeLubbers. Note: For some lakes, "Longest Shorelines" data is unknown or does not apply, so this table may display 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 longest shoreline length in miles. 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  |
Shoreline length in miles |
Lake description |
|---|---|---|
| Riffe Lake (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
52 mi | 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 Washington, WA (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
50 mi | 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 Tapps (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
42 mi | Also known as Tapps Reservoir Located in the populous Seattle and Puget Sound Region of Washington, Lake Tapps delivers water supply, recreation and sound fish ecology to residents … |
| Mayfield Lake (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
34 mi | 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 Sammamish, WA (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
18 mi | 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) |
12 mi | 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) |
4 mi | 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) |
3 mi | 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 … |
| Florence Lake (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
2 mi | Also known as Lake Florence Florence Lake is special to Seattle and Puget Sound residents. Local tribes were familiar with Anderson Island long before its ‘official’ discovery in … |
| Barclay Lake (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
1 mi | Barclay Lake plays a larger part in the recreational opportunities of the Seattle and Puget Sound region of Washington than its size would indicate. J … |
| Horseshoe Lake, WA (Seattle & Puget Sound Region, WA, US West Region, USA, Washington) |
1 mi | 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 … |