605 ILCS 5/3-104.3
The Department or, by agreement with the Department, the highway authority of any county or township or road district of this State may, as a federal-aid project, construct, reconstruct, or improve any road or highway under its jurisdiction which has been selected and designated by the Department as a part of the national scenic and recreational highway known as the Great River Road under 23 U.S.C. 148, and all of the provisions of that Section shall apply.
Any county or township or road district may use any funds available to it for highway purposes to pay its share of any project under this Section.
Except for the maintenance of recreational facilities and rest areas constructed adjacent to the road, the highway authority having jurisdiction over a road or highway prior to its improvement as a part of such national scenic and recreational highway shall continue to be responsible for maintenance, at its own expense.
605 ILCS 5/3-104.3