Illinois Route 100

Illinois Route 100 (IL-100) is a 159.09-mile-long (256.03 km) state highway in the southwest Illinois. It generally parallels the Illinois River. Starting in downtown Alton, it trends northward to Buckheart Township near Canton. It makes up much of the Illinois River Road, a U.S. National Scenic Byway.

Illinois Route 100

IL 100 highlighted in red
Route information
Maintained by IDOT
Length159.09 mi (256.03 km)
Existed1924–present
Major junctions
South end US 67 in Alton
Major intersections I-72 / US 36 in Bluffs
US 67 / IL 104 in Meredosia
US 67 / IL 103 in Frederick
US 24 / US 136 in Lewistown
North end IL 78 in Dunfermline
Location
CountryUnited States
StateIllinois
CountiesMadison, Jersey, Greene, Calhoun, Pike, Scott, Morgan, Cass, Schuyler, Fulton
Highway system
IL 99 IL 101
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