page_title: Illinois Route 171
section_title: Summit to Chicago
hierarchical_section_title: Illinois Route 171 / Route description / Summit to Chicago
caption_attribution_description: English: Route&#160;171 approaching Route&#160;72 in Chicago, Illinois.
context_page_description: Illinois Route 171 is a 38.61-mile-long north–south state road in northeastern Illinois. It runs from U.S. Route 6 in Joliet north to Illinois Route 72 at the Chicago–Park Ridge border. The section of IL 171 on Archer Avenue from Joliet to Summit is historically significant, originating as a Native American trail, and later serving for a time as part of the first numbered highway between St. Louis and Chicago.
  The current Illinois Route 171 incorporates part or all of previous IL 4, IL 4A, and IL 213.
context_section_description: At an intersection with West 55th Street in Summit, IL 171 bends sharply to the north, becoming a freeway for about two miles (3.2 km), crossing the Illinois and Michigan Canal, the Chicago Sanitary and Ship Canal, the Stevenson Expressway (I-55), and the Des Plaines River at a cloverleaf interchange whose ramps had to be built as bridges over these watercourses due to their close proximity to I-55. It then enters McCook and has interchanges with Joliet Road (Historic US 66), and West 47th Street at the border between McCook and Lyons, before the freeway ends at West 44th Place in Lyons. Continuing as First Avenue, IL 171 intersects US 34 at Ogden Avenue, and passes to the east of Brookfield Zoo in Brookfield. Continuing north into Maywood, it passes Loyola University Medical Center before intersecting I-290 (Eisenhower Expressway). It continues north through Melrose Park where it intersects IL 64 at North Avenue, and River Grove, where its name changes to Thatcher Avenue. At West Belmont Avenue, it enters the City of Chicago, becoming North Cumberland Avenue, at 8400 West in the Chicago address system. It intersects IL 19 at Irving Park Road. It then has a cloverleaf interchange with I-90 (Kennedy Expressway) before ending at IL 72 (Higgins Road), at the border between Chicago and Park Ridge, near O'Hare Airport.
caption: IL 171 approaching IL 72 in Chicago
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