Largest lakes & reservoirs in US West Region 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 329 articles we have published for US West Region lakes.
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Below are lakes within USA > US West Region > Compared by longest shoreline length in miles. This list does not represent all lakes in US West Region, only the 329 US West Region lake articles we have published on the LakeLubbers website.
Lake name  |
Shoreline length in miles |
Lake description |
|---|---|---|
| Great Salt Lake, UT (Great Salt Lake Country, UT, Ogden & Northwest Region, UT, US West Region, USA, Utah) |
10,000 mi | Also known as America's Dead Sea Sometimes called “America’s Dead Sea,” the Great Salt Lake occupies approximately 1,700 square miles of Utah’s real estate. It is the second largest l… |
| Lake Powell, AZ/UT (Arizona, Canyonlands Region, UT, Color Country, UT, North Central Arizona, US Southwest Region, US West Region, USA, Utah) |
1,900 mi | Lake Powell is located in one of Southern Utah’s most picturesque red-rock desert areas and in Arizona’s Navajo Indian Reservation. It is one of the U… |
| Fort Peck Lake, MT (Missouri River Country, MT, Montana, US West Region, USA) |
1,520 mi | Fort Peck Lake, located 20 miles southeast of Glasgow, Montana on Montana Highway 24, is the 5th-largest man-made reservoir by volume in the United St… |
| Lake Roosevelt, WA (Northeast Washington, US West Region, USA, Washington) |
630 mi | 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… |
| Lake Mead, AZ/NV (Arizona, Las Vegas Territory, NV, Nevada, US Southwest Region, US West Region, USA, West Coast Region, AZ) |
550 mi | Lake Mead is the USA’s largest man-made reservoir in amount of water it can hold. Although Lake Powell is marginally larger in acreage at full-pond, L… |
| Lake Havasu, AZ/CA (Arizona, California, Desert Region, CA, US Southwest Region, US West Region, USA, West Coast Region, AZ) |
450 mi | Lake Havasu’s 20,400 acres, formed behind Parker Dam on the Colorado River, is a boating paradise. Around Lake Havasu City, the most recognizable sigh… |
| Shasta Lake, CA (California, Shasta Cascade Region, CA, US West Region, USA) |
365 mi | Shasta Lake, one of the largest lakes in California, is an outdoor paradise of fresh blue water, awe-inspiring caverns, investigative trails, first cl… |
| Lake Koocanusa, MT / Canada (British Columbia, Canada, Canada, Glacier Country, MT, Montana, US West Region, USA) |
249 mi | Also known as Koocanusa Lake, Koocanusa Reservoir In the far north of the United States, tucked into the northwestern end of Montana, is the long, narrow Lake Koocanusa. This lake is actually a man-ma… |
| Lake Wallula, OR/WA (Eastern Oregon, Oregon, South Central Washington, US West Region, USA, Washington) |
242 mi | Lake Wallula, a 64 mile long reservoir, is a wide open glassy lake that extends from northeastern Oregon to southeastern Washington. Lake Wallula rece… |
| Flaming Gorge Reservoir, UT/WY (Dinosaurland Region, UT, Southwest Wyoming, US West Region, USA, Utah, Wyoming) |
208 mi | With more than 42,000 acres of boating and fishing waters, surrounded by choice camping and picnic areas, Flaming Gorge Reservoir – straddling the Wyo… |
| 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… |
| Dworshak Reservoir, ID (Idaho, North Central Idaho, US West Region, USA) |
183 mi | Dworshak Reservoir is an excellent outdoor recreation site with a great water playground of over 19,000 acres. Located in northern Idaho near the town… |