Illinois Route 23
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| Route information | ||||
| Maintained by IDOT | ||||
| Length: | 126.17 mi (203.05 km) | |||
| Existed: | November 5, 1918 – present | |||
| Major junctions | ||||
| South end: |
  Historic US 66 / IL 116 in Pontiac
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Historic US 66 in Pontiac I-55 in Pontiac  US 6 / IL 71 in Ottawa I-80 in Ottawa US 52 in Serena US 34 in Leland US 30 in Waterman US 20 in Marengo
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| North end: |
 US 14 in Harvard
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| Location | ||||
| Counties: | Livingston, LaSalle, DeKalb, McHenry | |||
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Illinois Route 23 is a north–south state highway in northern Illinois. It runs from Illinois Route 116 in Pontiac north to U.S. Route 14 south of Harvard. This is a distance of 126.17 miles (203.05 km).
Illinois 23 is a major arterial route in rural central and north-central Illinois. It is a parallel to the Interstate 39/U.S. Route 51 combination approximately 20 miles (32 km) to the west.
The road starts near downtown Pontiac and runs as the main highway north, intersecting with Interstate 55 and former U.S. Route 66. From this point, Illinois 23 continues as a 2-lane highway, turning west and running through Cornell. After that, it turns back north to travel through the middle of Streator, where the route splits to follow two different one-way streets (Park Street and Bloomington Street). Route 23 continues through Grand Ridge to Ottawa, where the road follows 1st Ave and State street, to form a concurrent with Illinois Route 71—Illinois 71 across the Illinois River. The highway once again splits into two one-way streets (Columbus and LaSalle Streets) through downtown Ottawa, until a block south of its junction with U.S. Route 6, where Illinois 71 departs toward the east.
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