Largest lakes & reservoirs in Oregon by acres
There is no widely-accepted minimum surface area that defines a lake. What LakeLubbers describes as a lake, you might call a pond. Acreage of a lake (or sometimes square kilometers) is most often measured at the top surface area when the lake is at normal elevation. The surface area can be considerably smaller or larger when lake levels are lower or higher than normal. North America’s Lake Superior is the world’s largest freshwater lake by this measure.The other measure of a lake’s size is the lake’s water volume. By that measure, the world’s largest freshwater lake is Lake Baikal in Siberia.
You can find many of the world’s largest lakes (acres) on LakeLubbers in the comparison table below. Note: For some lakes, "Largest Lakes - Acres" data is unknown or does not apply, so you may see fewer lakes than the total 29 articles we have published for Oregon lakes.
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Below are lakes within USA > US West Region > Oregon > Compared by surface area in acres. This list does not represent all lakes in Oregon, only the 29 Oregon lake articles we have published on the LakeLubbers website.
Lake name  |
Surface area in acres |
Lake description |
|---|---|---|
| Upper Klamath Lake, OR (Oregon, Southern Oregon, US West Region, USA) |
61,544 ac | Stretching for an impressive 30 miles, Upper Klamath Lake is the largest freshwater lake in the State of Oregon. Nestled in the Klamath Basin, it is s… |
| Lake Wallula, OR/WA (Eastern Oregon, Oregon, South Central Washington, US West Region, USA, Washington) |
38,800 ac | Lake Wallula, a 64 mile long reservoir, is a wide open glassy lake that extends from northeastern Oregon to southeastern Washington. Lake Wallula rece… |
| Hells Canyon Reservoirs (Eastern Oregon, Idaho, Oregon, Southwestern Idaho, US West Region, USA) |
15,000 ac | 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… |
| Crater Lake, OR (Oregon, Southern Oregon, US West Region, USA) |
13,056 ac | Crater Lake is on the crest of the Cascade Range in southern Oregon, about 100 miles from the ocean, and is the centerpiece of Crater Lake National Pa… |
| Wickiup Reservoir, OR (Central Oregon, Oregon, US West Region, USA) |
11,200 ac | Also known as Wickiup Lake Wickiup Reservoir is an 11,000 acre angler’s paradise. Camping areas are plentiful, and boat launching ramps are located at most. The reservoir gets i… |
| Lake Celilo, OR/WA (Mt. Hood-The Gorge Region, OR, Oregon, Southwest Washington, US West Region, USA, Washington) |
9,400 ac | 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… |
| Fern Ridge Lake, OR (Oregon, US West Region, USA, Willamette Valley Region, OR) |
9,000 ac | Also known as Fern Ridge Reservoir Fern Ridge Lake is the largest of thirteen flood control reservoirs in Oregon’s Williamette Valley. With 9000 acres of water, Fern Ridge Lake is a pre… |
| Waldo Lake, OR (Central Oregon, Oregon, US West Region, USA) |
6,298 ac | Waldo Lake is the second deepest natural lake in Oregon, sporting an impressive 420-feet deep pool of beautiful clear water with visibility exceeding… |
| Cascade Lakes (Central Oregon, Oregon, US West Region, USA) |
4,940 ac | Also known as Todd Lake, Sparks Lake, Davis Lake, Elk Lake, Devils Lake, JHosmer Lake, Lava Lake, Little Lava Lake, Custus Lake, Little Custus Lake, Crane Prairie Reservoir, North Twin Lake, South Twin Lake, Wickiup Reservoir, Crescent Lake Whether it be a scenic day trip along the Cascade Lakes Scenic Byway, a leisurely day hike, or a rugged back country camping trek, the Cascade Lakes o… |
| Crescent Lake, OR (Central Oregon, Oregon, US West Region, USA) |
4,008 ac | Crescent Lake, aptly named for its shape, lies on the eastern slope of the Cascade Mountains, in the northwest corner of Klamath County, Oregon. With… |
| Detroit Lake, OR (Oregon, US West Region, USA, Willamette Valley Region, OR) |
3,580 ac | Conveniently located just 46 miles south of Salem in Oregon’s Willamette Valley tourism region lies Detroit Lake, a 3,580-acre artificial freshwater r… |
| Odell Lake, OR (Central Oregon, Oregon, US West Region, USA) |
3,562 ac | Six miles long and one and a half miles wide, Odell Lake sits under the scenic shadow of Diamond Peak in the Deschutes National Forest, offering wonde… |