Illinois Route 21 | ||||
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Milwaukee Avenue Riverside Drive |
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Route information | ||||
Maintained by IDOT | ||||
Length: | 28.13 mi (45.27 km) | |||
Existed: | November 5, 1918 – present | |||
Major junctions | ||||
South end: | IL 43 in Niles | |||
US 14 in Niles US 45 in Prospect Heights US 45 in Lincolnshire I-94 in Gurnee |
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North end: | US 41 in Gurnee | |||
Location | ||||
Counties: | Cook, Lake | |||
Highway system | ||||
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Illinois Route 21 is an arterial north–south state highway in northeastern Illinois. It runs from Illinois Route 43 (Harlem Avenue) in Niles to U.S. Route 41 (Skokie Highway) north of Gurnee. Illinois 21 is 28.13 miles (45.27 km) long.
Along most of its length, Illinois 21 is called Milwaukee Avenue. North of Gurnee, it is called Riverside Drive.
Illinois 21 was the principal route to Milwaukee, Wisconsin before the construction of both the Skokie Highway and the Tri-State Tollway (Interstate 94 and Interstate 294). The towns of Glenview, Libertyville, and Gurnee are principally located along this road. It follows the Des Plaines River for its entire length, and overlaps U.S. Route 45 between Lincolnshire and Prospect Heights.
South of Illinois 43, Milwaukee Avenue remains a major arterial road until it reaches the downtown area of Chicago, where its historical terminus at Lake Street has been moved back to Grand Avenue. It is one of the few diagonal streets in the grid street layout of Chicago.