 A feature of the site is the "Old Fort Earthworks", a part of the Portsmouth Earthworks known as Group A.The earthworks include a northern section consisting of a number of circular enclosures, two large horseshoe-shaped enclosures, and three sets of parallel-walled roads leading away from this location.One set of walls went to the southwest and may have been linked by an earthen causeway to a large square enclosure located on the Kentucky side of the Ohio River.