Ross Bridge Ruins Trailhead (located at the confluence of the north and south forks of the Holston river).  Has parking access.  Is adjacent to a picnic shelter and an historical marker.  The old map says this (Still visible in the river in front of Rotherwood mansion are the stone piers from the 1818 400-foot wooden covered bridge, where the Great Stage Road crossed the north fork of the Holston River.  The bridge was destroyed by floods and rebuilt several times during its many years of service).