70 ILCS 1250/1
That every board of park commissioners, existing under the laws of this state, that now has, or may hereafter have, control over any boulevard or driveway connecting with any public park under the control of such board, and bordering upon any public waters in this state, shall have power, subject to the limitations in this act contained, to extend such boulevard or driveway, of the width of not more than two hundred feet over and upon the bed of such public waters: Provided, however, that no such boulevard or driveway shall be extended under the provisions of this act in such a manner as to interfere with the navigation of such public waters for the purposes of commerce; and that the lands adjacent to such public waters and connected with the termini of such boulevard or driveway as extended under the provisions of this act, shall lie within the district or territory, the property of which shall be taxable for the maintenance of the parks under the control of such board.
70 ILCS 1250/1