Interstate 90 travels 124 miles across northeastern Illinois, connecting Chicago with Rockford and Madison, Wisconsin to the north and Gary, Hammond and Lake Station in northwest Indiana. The route in Illinois follows four distinct roads. The Jane Addams Memorial Tollway carries I-90 southeast from the state line at South Beloit to the Kennedy Expressway at O'Hare in Chicago. Heading southeast into Chicago, I-90 follows the Kennedy Expressway to the Edens Expressway, where I-94 merges with I-90 at Jefferson Park. The two routes overlap from there south to the Jane Byrne (Circle) Interchange with Interstate 290 just west of Downtown.
The Kennedy Expressway transitions into the Dan Ryan Expressway south from the Circle Interchange, doubling as both Interstates 90 and 94 to Englewood. I-90 branches southeast along the Chicago Skyway from Park Manor to Chicago's East Side and the Indiana state line. I-94 extends south along the Dan Ryan Expressway to Princeton Park and Interstate 57.
Prior to 1978, the Kennedy Expressway north from the Circle Interchange to the Edens Expressway was numbered as I-94 alone, and the remainder of the expressway to the Northwest Tollway designated as Illinois 194. Interstate 90 instead followed what is now Interstate 290 along the Eisenhower Expressway west from Chicago to Oak Park and Hillside.
Opened in April 1958, the Chicago Skyway connects the Dan Ryan Expressway with the Indiana East-West Toll Road. The toll road and bridge system was the alignment of Interstate 94, with I-90 following the Dan Ryan Expressway and Bishop Ford Memorial Freeway south to I-80 / 294, where it turned east. I-90 accompanied I-80 / 294 on the Kingery Expressway to the Borman Expressway across Hammond and Gary, Indiana. I-90 and 94 switched places in 1963, with I-294 truncated from Indiana west to The Tri-State Tollway at South Holland.
Page Updated 05-04-2018.