Largest lakes & reservoirs in Southwest Washington 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 5 articles we have published for Southwest Washington lakes.
Thinking about booking a Southwest Washington lake vacation home rental, cabin or hotel?
Use our free interactive vacation rental map to search and compare multiple vacation properties at a glance. Enter a lake name, a state or city and then simply click on a listing to compare all similar properties, best rates and availability for your dates.Search results: Sort lakes by miles of shoreline
Below are lakes within USA > US West Region > Washington > Southwest Washington > Compared by longest shoreline length in miles. This list does not represent all lakes in Southwest Washington, only the 5 Southwest Washington lake articles we have published on the LakeLubbers website.
Lake name  |
Shoreline length in miles |
Lake description |
|---|---|---|
| Lake Celilo, OR/WA (Mt. Hood-The Gorge Region, OR, Oregon, Southwest Washington, US West Region, USA, Washington) |
55 mi | 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… |
| Alder Lake (Southwest Washington, US West Region, USA, Washington) |
28 mi | 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… |
| Vancouver Lake (Southwest Washington, US West Region, USA, Washington) |
7 mi | Lying serenely in the Southwest Region of Washington state, Vancouver Lake provides a quiet respite from the cities of Vancouver, Washington and its n… |
| Silver Lake Cowlitz County, WA (Southwest Washington, US West Region, USA, Washington) |
4 mi | 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… |