Deepest lakes & reservoirs in US West Region by maximum depth (ft)
The estimated greatest depth of the water in a lake can be measured at the lake’s normal elevation. If the water volume and surface area of a lake are known, an estimate of the lake’s average depth can be calculated:Water volume ÷ Surface Area = Average Depth
Example: 1,000,000 acre-feet ÷ 20,000 acres = 50 feet average depth.
You can find many of the the world’s deepest lakes on LakeLubbers. If you sort the list, you will find the (maximum depth of) the shallowest lakes in our database. Note: For some lakes, lake depth data is unknown, 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 maximum depth in feet. 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 | Max depth in feet | Lake description |
---|---|---|
Flathead Lake, MT (Glacier Country, MT, Montana, US West Region, USA) |
371 ft | Carved out by the historic glaciers of the last ice age approximately 11,000 years ago, Flathead Lake is one of the largest natural freshwater lakes i … |
Lake Koocanusa, MT / Canada (British Columbia, Canada, Canada, Glacier Country, MT, Montana, US West Region, USA) |
370 ft | 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 … |
Priest Lake, ID (Idaho, Northern Idaho, US West Region, USA) |
369 ft | Located in the most northern portion of Idaho’s Panhandle, Priest Lake is within 30 miles of the Canadian Border. Priest Lake was naturally created at … |
Pyramid Lake, NV (Nevada, Renoe-Tahoe Territory, NV, US West Region, USA) |
344 ft | Pyramid Lake is a true natural wonder located in the Pyramid Lake Paiute Indian Reservation in western Nevada. Covering 117,400 acres, it is the third … |
Blue Mesa Reservoir, CO (Colorado, Southwest Colorado, US West Region, USA) |
342 ft | Also known as Blue Mesa Lake Beautiful mesas, deep canyons, and steep rocky cliffs surround Blue Mesa Reservoir, the second largest lake entirely in Colorado. The clear, blue, mou … |
Cle Elum Lake, WA (North Central Washington, US West Region, USA, Washington) |
333 ft | Also known as Lake Cle Elum Providing much needed water to the dry, fertile soil of north-central Washington, Cle Elum Lake is the largest of four irrigation storage reservoirs i … |
Lake Ozette, WA (Olympic Peninsula & Pacific Coast Region, WA, US West Region, USA, Washington) |
331 ft | Also known as Ozette Lake Nestled in dense forest just a few miles from the Pacific Coast, Lake Ozette sits snuggled into Washington’s Olympic Peninsula tourism region, on the … |
Castaic Lake, CA (California, Los Angeles County, CA, US West Region, USA) |
330 ft | Also known as Lake Castaic Almost every lake promises something for everyone, but Castaic Lake in Los Angeles County, California delivers. With separate sections of its 2,427 ac … |
Whatcom Lake, WA (Northwest Washington & Islands, WA, US West Region, USA, Washington) |
330 ft | Also known as Lake Whatcom Whatcom Lake is a 5,000-acre natural lake surrounded by mountainous terrain located in Whatcom County, Washington. Whatcom is from a Nooksack Indian w … |
Anderson Ranch Reservoir (Idaho, Southwestern Idaho, US West Region, USA) |
315 ft | 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 … |
Payette Lake, ID (Idaho, Southwestern Idaho, US West Region, USA) |
304 ft | 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 … |
Saint Mary Lake (Glacier Country, MT, Montana, US West Region, USA) |
300 ft | Also known as St. Mary Lake, Saint Mary's Lake, St. Mary's Lake At 3900 acres, Saint Mary Lake is the second-largest lake in Glacier National Park. Saint Mary Lake is one of the most visited lakes, because the popu … |