Ohio Rev. Code § 1545.17
When a public highway extends into or through a park area, or when a public highway forms all or part of a suitable connection between two or more park areas, and it is deemed advisable to make alterations in the route or width of such highway, or to grade, drain, pave, or otherwise improve such highway, boards of park commissioners may enter into agreements with the public authorities in charge or control of so much of said highway as lies within such park area or which forms the whole or part of a connecting link between two or more park areas, providing for the doing of any of such things, under the procedure authorized by law in case of such public authorities, and for the payment by such boards of so much of the cost thereof as is agreed upon. This section does not affect the legal status of such highway.
R.C. §1545.17