The Summersville Dam is a pre-War installation that powered the nearby towns and cities with hydroelectric power. It also created an artificial lake near Charleston. Although the residents of the city were close to having it repaired, the dam would also eventually be the downfall of Charleston. After the Cutthroat Rosalynn Jeffries was captured by the Responders, her partner, David Thorpe, believing her to have perished, used a mini nuke to avenge her by destroying the dam on Christmas morning. This caused Summersville Lake to catastrophically flood Charleston, killing Rosalynn and over one thousand other survivors and Responder members in what would be known as the Christmas Flood.
A group of raiders built watchtowers and a crude bridge across the gap. The bridge has not been maintained in some time and has a broken section in the middle that must be jumped across; failing the jump means a long drop to certain death.
- Charleston is ours - Note, on a table on one of the guard towers below the dam, along the scaffolding leading to the bottom.
- Cursed - Note, on the bridge connecting the two ends of the dam, next to a dead raider.
- The Evil Men - Note, inside of the wreckage of a green boat at the bottom of the dam.
- The power plant - Note, on a desk next to a broken terminal in the building at the top of the dam.
The Summersville Dam appears only in Fallout 76.