Ohio Revised Code Title LV. Roads Highways Bridges § 5555.49

For the purpose of providing by taxation a fund for the payment of the proportion of the compensation, damages, and expenses of the improvement to be paid by the townships in which such improvement is situated in whole or in part, the board of county commissioners may levy a tax not exceeding three mills in any one year upon all the taxable property of such townships. Such levy shall be in addition to all other levies authorized by law for township purposes, and subject only to the limitation on the combined maximum rate for all taxes.