Carnifex Ferry Battlefield State Park is an American Civil War battle site that commemorates the Battle of Carnifex Ferry. It is located on the rim of the Gauley River Canyon near Summersville, a town in Nicholas County, West Virginia. The 156-acre (0.63 km²) park features Patterson House Museum, three views of the Gauley River, hiking trails and picnic facilities. It is one of the oldest state parks in the United States. A Civil War re-enactment takes place on a weekend after Labor Day. As Carnifex Ferry State Park, it was listed on the National Register of Historic Places in 1974.