Ohio Rev. Code Ann. § 5591.04

The bridge construction contract provided for by section 5591.03 of the Revised Code shall provide for the construction, use, and maintenance of that part of the joint bridge intended or to be used for general highway traffic and for sufficient pier supports to carry that part of such bridge used or intended to be used for general highway traffic, and shall be executed by the board of county commissioners, on behalf of any county, pursuant to authorization contained in the resolution determining to proceed with said joint bridge construction provided in section 5591.09 of the Revised Code, and by the president and secretary of any railroad or union depot company, on behalf of such company, pursuant to authorization of its board of directors.