605 ILCS 5/6-309
The damages sustained by the owner or owners of land by reason of the laying out, widening, alteration or vacation of a township or district road, may be agreed upon by the owners of such lands, if competent to contract, and the highway commissioner or county superintendent, as the case may be. Such damages may also be released by such owners, and in such case the agreement or release shall be in writing, the same shall be filed and recorded with the copy of the order laying out, widening, altering or vacating such road in the office of the district clerk, and shall be a perpetual bar against such owners, their grantees and assigns for all further claims for such damages.
In case the highway commissioner or the county superintendent, as the case may be, acting for the road district, is unable to agree with the owner or owners of the land necessary for the laying out, widening or alteration of such road on the compensation to be paid, the highway commissioner, or the county superintendent of highways, as the case may be, may in the name of the road district, enter condemnation proceedings to procure such land, in the same manner as near as may be, as provided for the exercise of the right of eminent domain under the Eminent Domain Act .
605 ILCS 5/6-309