70 ILCS 615/5

Such corporate authorities may acquire by purchase, gift, condemnation or otherwise all the real and personal property, rights of way and easements within or without the district necessary for the construction and maintenance of the works hereby authorized, and shall have the same control and jurisdiction of the property without as of that within the district. They shall have the right to construct the cut-off herein authorized, across, under, over, along, or upon any water course, street, highway, public ground, railroad or turnpike which the route of the same may intersect or touch; but shall not interrupt the use thereof longer nor to a greater extent than shall be necessary for the purpose.