605 ILCS 115/2

Any person or corporation may petition the county board for leave to establish and erect a toll bridge, and if said board shall deem such bridge necessary, it may authorize the establishment and erection thereof upon such terms and conditions as it shall deem for the public good: Provided, that no bridge shall be constructed over any navigable water without a suitable draw for the passage of water-craft, nor in such manner as to interfere with navigation.