605 ILCS 5/9-111.1

The highway authorities shall from time to time inspect the bridges and culverts on the public highways and streets under their respective jurisdictions which span streams and watercourses and shall remove driftwood and other materials accumulated within the right of way at such structures which obstruct the free flow of either low or highwater. Any general funds, and any forces and equipment available for maintenance of the public highways or streets may be used for the removal of such accumulated material.