70 ILCS 1815/29
It is not lawful to make any fill or deposit of rock, earth, sand, or other material, or any refuse matter of any kind or description, or build or commence the building of any wharf, pier, dolphin boom, weir, breakwater, bulkhead, jetty, bridge, or other structure over, under, in or within 40 feet of any navigable waters within the Port District without first submitting the plans, profiles, and specifications therefor and such other data and information as may be required, to the Port District and receiving a permit therefor. Any person, corporation, company, city or municipality or other agency, which shall do any of the things prohibited by this Section, without securing a permit shall be guilty of a Class A misdemeanor. Any structure, fill or deposit erected or made in any public body of water within the Port District, in violation of this Section, is declared to be a purpresture and may be abated as such at the expense of the person, corporation, company, city, municipality or other agency responsible therefor, or if the Port District decides that such structure, fill or deposit may remain, the Port District may fix such rule, regulation, requirement, restrictions or rentals, or require and compel all changes, modifications and repairs which are deemed necessary to protect the interest of the Port District.
70 ILCS 1815/29