615 ILCS 50/2
In the execution of the powers herein granted and the duties vested in the Department of Natural Resources, the Department shall make all necessary surveys, collect all necessary data and cooperate and enter into agreements with any and all agencies of the United States, the International Joint Commission, the Canadian provinces of Ontario and Quebec, other States, municipal corporations of this and other States, regional organizations, public or private corporations, associations and individuals for the formulation of plans and construction of all projects for the regulation and maintenance of the levels of Lake Michigan and for the extraction and utilization of waters taken from Lake Michigan and other resources located in the counties of Cook, DuPage, Kane, Lake, McHenry and Will.
615 ILCS 50/2