Interstate 80 in Illinois

Interstate 80 (I-80) is a part of the Interstate Highway System that runs from San Francisco, California, to Teaneck, New Jersey. I-80 enters Illinois from Iowa in the west, southwest of Rapids City, and runs generally eastward through East Moline, LaSalle, and Joliet, before entering Indiana in Lansing. The Interstate runs for approximately 163.52 miles (263.16 km) through the state.

This article is about the section of Interstate 80 in Illinois. For the entire route, see Interstate 80.

Interstate 80

I-80 highlighted in red
Route information
Maintained by IDOT and ISTHA
Length163.52 mi (263.16 km)
Existed1967–present
NHSEntire route
Major junctions
West end I-80 at East Moline
Major intersections
East end I-80 / I-94 / US 6 at Lansing
Location
CountryUnited States
StateIllinois
CountiesRock Island, Henry, Bureau, LaSalle, Grundy, Kendall, Will, Cook
Highway system
  • Main
  • Auxiliary
  • Suffixed
  • Business
  • Future
← IL 78→ IL 81

In the 1920s, two state highways followed the general alignment that I-80 takes. In 1932, US Route 6 (US 6) was extended through Illinois, paralleling the alignment that I-80 in Illinois takes today. Construction started in 1957, and I-80 was completed in 1968. In the early 1990s, Illinois wanted to reroute I-80 in the Quad Cities area. At the same time, the section of I-80 that is concurrent with I-294 was reconstructed. The portion of I-80 that is concurrent with the Kingery Expressway was rebuilt in the mid-2000s.

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