Largest lakes & reservoirs in Southwestern Idaho 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 7 articles we have published for Southwestern Idaho lakes.
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Below are lakes within USA > US West Region > Idaho > Southwestern Idaho > Compared by longest shoreline length in miles. This list does not represent all lakes in Southwestern Idaho, only the 7 Southwestern Idaho lake articles we have published on the LakeLubbers website.
Lake name  |
Shoreline length in miles |
Lake description |
|---|---|---|
| Hells Canyon Reservoirs (Eastern Oregon, Idaho, Oregon, Southwestern Idaho, US West Region, USA) |
193 mi | Also known as Brownlee Reservoir, Oxbow Reservoir, Hells Canyon Reservoir The three Hells Canyon Reservoirs are one of southwest Idaho’s most scenic locations. Idaho can’t claim this national treasure alone, however as it sh… |
| Lake Cascade, ID (Idaho, Southwestern Idaho, US West Region, USA) |
86 mi | Also known as Cascade Reservoir Lake Cascade (Cascade Reservoir) is the fourth largest lake in Idaho, creating an extensive and diverse recreation site for visitors. Its nearly 30,00… |
| Arrowrock Reservoir (Idaho, Southwestern Idaho, US West Region, USA) |
60 mi | One in a string of three major reservoirs built to irrigate the parched Boise Valley, Arrowrock Reservoir has contributed to water recreation in south… |
| Anderson Ranch Reservoir (Idaho, Southwestern Idaho, US West Region, USA) |
50 mi | One of the true gems of the Idaho reservoir system is Anderson Ranch Reservoir. Completed along the South Fork of the Boise River in 1950, this projec… |
| Lucky Peak Lake (Idaho, Southwestern Idaho, US West Region, USA) |
45 mi | Also known as Lucky Peak Reservoir Home of Idaho’s most visited state park, Lucky Peak Lake (sometimes called Lucky Peak Reservoir) covers over 3,000 acres just outside of the capital c… |
| Payette Lake, ID (Idaho, Southwestern Idaho, US West Region, USA) |
21 mi | Also known as Big Payette Lake One hundred miles north of Boise, nearly surrounded by Payette National Forest, lies breathtaking Payette Lake. Nestled beneath the peaks of the West… |