Ohio Rev. Code § 5511.05
The director of transportation may establish, construct, reconstruct, improve, repair, and maintain roads leading from a state highway to any state park, including all such parks and properties under the control and custody of the department of natural resources and the Ohio history connection, or roads leading from a state highway to any state property used for military purposes, or any road which leads along the side of or through school lands which are owned by the state. The director shall confer with the authority in control of any such park or property before deciding upon the location and character of any such improvement. The director may add such roads to the state highway system. Such additional mileage is in addition to and not subject to section 5511.01 of the Revised Code.
The director may establish, construct, reconstruct, improve, repair, and maintain roads within the boundary of any state park, including all such parks and properties under the control and custody of the department of natural resources and the Ohio history connection or used for military purposes, provided the officer or board which has control of or supervision over such property first requests in writing the establishment, construction, reconstruction, improvement, repair, and maintenance of such road. Thereafter the director may cause to be prepared the necessary engineering plans and specifications for construction and reconstruction, which plans and specifications shall be subject to the approval of the officer or board which has control of or supervision over such property. Such roads shall be maintained in a manner agreed upon between the director and such officer or board.
The director may install and maintain suitable, uniform markers designating intersections with and accesses to state recreational trails, where trails established pursuant to Chapter 1519. of the Revised Code intersect with a state highway. The director may cooperate with the director of natural resources in providing appropriate means for such trails to cross highways.
The costs of such establishment, construction, installation, reconstruction, improvement, repair, and maintenance shall be paid from highway operating funds.
R.C. § 5511.05