Ohio Rev. Code § 505.36
When the voters of a township determine to issue bonds for the construction or repair of viaducts, or for the purchase or condemnation of the land necessary for such improvements, the authority to make such improvements is hereby conferred and the money arising from the sale of the bonds shall be expended in the manner provided by section 505.35 of the Revised Code.
If a municipal corporation or the board of county commissioners determines to construct or repair a viaduct over any street, steam railroad tracks, or other place, where an overhead roadway or footway is deemed necessary, under any law authorizing the construction of bridges or viaducts or the elimination of grade crossings, and such construction or repair will benefit the township, the board of township trustees may, by agreement with such municipal corporation or the board of county commissioners, pay that part of the cost and expense of such improvement, including compensations for land taken and damages, as is deemed just by the board of township trustees. The cost so assumed by the township shall be paid out of any funds in the treasury of such township provided for the construction or repair of such viaduct, into the treasury of such municipal corporation or county, to the credit of such special fund, or, the board of township trustees may issue bonds for such purpose.
R.C. § 505.36