70 ILCS 1807/90
It shall be unlawful 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 district without first submitting the plans, profiles, and specifications for it, and any other data and information that may be required, to the district and receiving a permit. Any person, corporation, company, city or municipality, or other agency that does any of the things prohibited in this Section without securing a permit is guilty of a Class A misdemeanor. Any structure, fill, or deposit erected or made in any of the public bodies of water within the district in violation of the provisions 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 for it. If in the discretion of the district it is decided that the structure, fill, or deposit may remain, the district may fix any rule, regulation, requirement, restrictions, or rentals or require and compel any changes, modifications, and repairs that shall be necessary to protect the interest of the district.
70 ILCS 1807/90