Before the Great War, Summersville Lake was a reservoir created by the Summersville Dam on the Gauley River. In 2082, raider David Thorpe destroyed the dam, letting the reservoir flood through the nearby city of Charleston in what would be called The Christmas Flood. By 2102, Summersville Lake has become a dry lake bed.
Near the center of the former lake is New Gad, a post-War settlement constructed on the ruins of the town of Gad, which had been submerged by the reservoir. The Lakeside Cabins sit on the north shore, overlook cabin on the east shore, the Summersville Docks on the west shore, and the destroyed Summersville Dam is to the south.
Beside the wreckage of a sailed ship, a skeleton with a pistol has its feet encased in concrete, alluding to a mob-style murder that took place before the war.
The Summersville Lake appears only in Fallout 76.