Largest lakes & reservoirs in Oregon 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 29 articles we have published for Oregon lakes.
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Below are lakes within USA > US West Region > Oregon > Compared by longest shoreline length in miles. This list does not represent all lakes in Oregon, only the 29 Oregon lake articles we have published on the LakeLubbers website.
Lake name  |
Shoreline length in miles |
Lake description |
|---|---|---|
| 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… |
| 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… |
| Upper Klamath Lake, OR (Oregon, Southern Oregon, US West Region, USA) |
88 mi | 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 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… |
| Wickiup Reservoir, OR (Central Oregon, Oregon, US West Region, USA) |
48 mi | 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… |
| Tenmile Lake (Oregon, The Coast Region, OR, US West Region, USA) |
43 mi | Also known as North Tenmile Lake Tenmile Lake is a large, recreational lake near the city of Lakeside in Coos County, Oregon. Tenmile Lake is actually two lakes, North Tenmile Lake an… |
| Prineville Reservoir, OR (Central Oregon, Oregon, US West Region, USA) |
43 mi | The 3,030-acre Prineville Reservoir is one of Central Oregon’s prolific fishing and outdoor recreation water bodies. The lake’s well-developed public… |
| Fern Ridge Lake, OR (Oregon, US West Region, USA, Willamette Valley Region, OR) |
32 mi | 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… |
| Detroit Lake, OR (Oregon, US West Region, USA, Willamette Valley Region, OR) |
32 mi | 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… |
| Crater Lake, OR (Oregon, Southern Oregon, US West Region, USA) |
26 mi | 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… |
| Cascade Lakes (Central Oregon, Oregon, US West Region, USA) |
24 mi | 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… |
| Waldo Lake, OR (Central Oregon, Oregon, US West Region, USA) |
22 mi | Waldo Lake is the second deepest natural lake in Oregon, sporting an impressive 420-feet deep pool of beautiful clear water with visibility exceeding… |