Secondary State Highway 13A

SSH 13A was added to the state highway system in 1937. This route began at Jct PSH 13 (US 101) at Raymond and headed west past Tokeland then north to the north end of Westport. Another section of SSH 13A started at Jct PSH 13 (US 101) in South Aberdeen and headed westerly to Jct SSH 13A on the south side of Westport.

Although the route as described above was designated a state highway in 1937, part of the route from Raymond to the Tokeland area, including the North River bridge, was not built until circa 1962. When the current state highway numbering system was first posted in January 1964, SSH 13A from Raymond via the south side of Westport to South Aberdeen became SR 105. The route from Jct SR 105 on the south side of Westport to the north side of Westport became SR 105 Spur.