Lewiston Lake

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Lewiston Lake
Lewiston dam us bor.jpg
Lewiston Dam on the Trinity River forming the lake behind
Location Trinity County, California
Coordinates 40°43′35″N 122°46′59″W / 40.72639°N 122.78306°W / 40.72639; -122.78306Coordinates: 40°43′35″N 122°46′59″W / 40.72639°N 122.78306°W / 40.72639; -122.78306
Type Reservoir
Primary inflows Trinity River
Primary outflows Trinity River
Basin countries United States
Surface area 750 acres (300 ha)
Water volume 14,660 acre·ft (18,080,000 m3)
Surface elevation 1,903 ft (580 m)
Settlements Weaverville, California

Lewiston Lake is a reservoir impounded by Lewiston Dam on the Trinity River, in Trinity County, California.


Lewiston Lake is near the towns of Weaverville and Lewiston in Trinity County, California.

It is used for transbasin diversion to the Sacramento River and flood control, as well as for hydroelectric generation. It is in the canyon between the Trinity Mountains and Marble Mountains of the southern Klamath Mountains System.


Lewiston reservoir is within the Trinity Unit of the Whiskeytown-Shasta-Trinity National Recreation Area, in the Shasta-Trinity National Forest. It is a popular destination for fishing, kayaking, and camping.

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