Ohio Revised Code Title LV. Roads Highways Bridges § 5543.09

(A) Except as provided in division (B) of this section, the county engineer shall supervise the construction, reconstruction, improvement, maintenance, and repair of the highways, bridges, and culverts under the jurisdiction of the board of county commissioners, and the construction, reconstruction, resurfacing, and improvement of public roads by boards of township trustees under sections 5571.01, 5571.06, 5571.07, 5571.15, 5573.01 to 5573.15, 5575.02 to 5575.09, and 5577.01 of the Revised Code. When the engineer has charge of the highways, bridges, and culverts within the engineer's county, and under the control of the state, the engineer shall also supervise their construction, reconstruction, improvement, and repair.

(B) For any particular project, with the approval of the county engineer, the board of township trustees of a township that has adopted a limited home rule government under Chapter 504. of the Revised Code may hire an independent professional engineer to assist the county engineer with the supervision of the construction, reconstruction, resurfacing, and improvement of public roads by the board under sections 5571.01, 5571.06, 5571.07, 5571.15, 5573.01 to 5573.15, 5575.02 to 5575.09, and 5577.01 of the Revised Code.