This bridge's construction date is unknown but is believed to be named after William Jackson, who owned a Grist Mill near the bridge site in the 1870s and 1880s. This Queenpost truss-type bridge is 14' wide and 35' long. It is covered with vertical board siding on both sides and portals. Painted barn red both inside and out, except for the replacement boards, which are unpainted. The roof is sheet metal, the deck has crosswise planking, and the sides have two windows. The deck is reinforced with wooded, trestle-type supports, which rest in the streambed. It sits on cut stone-and-mortar abutments laid up on concrete footings that are extended to form stone-and-mortar wing walls. One of the wing walls has been replaced with concrete.