Ohio Rev. Code § 4957.22: Height of viaduct.

Any way, crossing, or viaduct constructed over a railroad track in any municipal corporation shall be of such height as not to be of less than twenty-one feet in the clear from the top surface of the rails in the railroad track to the lowest point or projection of such overhead way, crossing, or viaduct, unless the railroad company consents to, or the court of common pleas orders, a less height. In no event shall such court order a less height than sixteen feet and three inches.