Interstate 80 | ||||
|---|---|---|---|---|
 I-80 highlighted in red | ||||
| Route information | ||||
| Maintained by IDOT and ISTHA | ||||
| Length | 163.52 mi[1] (263.16 km) | |||
| Existed | 1967–present | |||
| NHS | Entire route | |||
| Major junctions | ||||
| West end |  I-80 at East Moline | |||
| ||||
| East end |   I-80 / I-94 / US 6 at Lansing | |||
| Location | ||||
| Country | United States | |||
| State | Illinois | |||
| Counties | Rock Island, Henry, Bureau, LaSalle, Grundy, Kendall, Will, Cook | |||
| Highway system | ||||
| ||||
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.
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.
- ^ "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. December 31, 2021. Retrieved June 17, 2022.