70 ILCS 2105/18
Every such conservancy district is authorized to construct, maintain, alter and extend its sewers, pipelines, channels, ditches and drains along, upon, under and across any highway, street, alley or public ground in the State as a proper use of highways, but so as not to incommode the public use thereof, and the right and authority are hereby granted to any such district to construct, maintain and operate any conduits, mainpipe or pipes, wholly or partially submerged, buried, or otherwise, in, upon and along any of the lands owned by said State and under any of the public waters therein; Provided, that the extent and location of the lands and waters so to be used and appropriated shall be approved by the Governor of said State of Illinois, upon application duly made to him asking for such approval: And provided further, that the rights, permission and authority hereby granted shall be subject to all public rights of commerce and navigation, and to the authority of the United States in behalf of such public rights and also to the right of said State of Illinois to regulate and control fishing in said public waters.
70 ILCS 2105/18