The South Salem Covered Bridge is a historic covered bridge in northwestern Ross County, Ohio, United States. Built in the 1870s, it has been designated a historic site because of its well-preserved historic engineering. Since its construction, it has carried Lower Twin Road over Buckskin Creek in Buckskin Township.[2] The bridge is a wooden Smith truss bridge, built in 1873 according to a design patented by Ohioan Robert Smith in the late 1860s. Eight wooden panels wide, it rests on stone abutments and is covered with a metal roof.[3]