The board of trustees of any sanitary district organized under this Act shall have power to provide for, construct, install or pay the costs of any compensating or controlling works in the Great Lakes or in any channels, outlets or rivers leading therefrom or connected therewith outside of the territorial boundaries of such sanitary district where proper or necessary for the purpose of complying with this Act, or with any restriction or regulation on the power of such sanitary district under this Act by Federal authorities or by Act of Congress in the interest of navigation; and to enter into any proper or necessary contracts connected therewith.
70 ILCS 2605/24A