65 ILCS 5/11-87-5
Whenever any city or village has changed, altered, or relocated or provides by ordinance to change, alter, or relocate the channel, course, or bed of any natural or artificial watercourse or stream, within the corporate limits of the city or village, and provides by ordinance to lay out, establish, open, alter, widen, extend, grade, pave, construct, or otherwise improve streets, alleys, avenues, sidewalks, viaducts, subway tunnels, or any of them, and any such improvement consists of or requires the taking or damaging of property within one-half mile of any part of the channel, course, or bed of such a natural or artificial course or stream as changed or provided by ordinance to be changed, altered, or relocated, the corporate authorities of the city or village may acquire by condemnation, all property that may be required to enable them to make the improvement.
65 ILCS 5/11-87-5