625 ILCS 45/1-3: Application and jurisdiction.

The Department shall, for the purposes of this Act, have full and complete jurisdiction of all waters within the boundaries of the State of Illinois, subject only to the paramount authority of the Federal Government with reference to the navigation of such stream or streams and further subject to such powers as may be granted to political subdivisions of the State. Wherever the provisions of this Act conflict with the laws and regulations of the Federal Government, the laws and regulations of the Federal Government shall take precedence.