Illinois Route 111
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| Route information | ||||
| Maintained by IDOT | ||||
| Length: | 82.18 mi (132.26 km) | |||
| Existed: | 1924 – present | |||
| Major junctions | ||||
| South end: | Lake Drive in Centreville | |||
 I-64 in Washington Park   US 40 / I-55 / I-70 in Collinsville I-270 in Pontoon Beach  IL 3 / US 67 in Alton US 67 / IL 267 in Godfrey
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| North end: |
 IL 104 in Waverly
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| Location | ||||
| Counties: | St. Clair, Madison, Jersey, Macoupin, Morgan | |||
| Highway system | ||||
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Illinois Route 111 (IL 111) is a 82.18-mile-long (132.26 km) north–south state highway in the southwestern part of the U.S. state of Illinois. It travels from Short Street (near Lake Drive and 1⁄4 mile (0.40 km) northwest of Interstate 255) in Centreville to IL 104 in Waverly.
IL 111 has concurrencies with IL 3 in Alton, U.S. Route 67 (US 67) in Godfrey, and IL 267 from Godfrey to Medora.
In August 1960, a new alignment in Alton on what is now the Homer M. Adams Parkway opened to traffic from IL 100 to IL 140. A second new alignment, Bellwood Road Extension in Bethalto, opened a few years later that would link IL 111 up with Vaughn and Central in Wood River. The original alignment of IL 111 in Alton had it cut up Sixth Street in Wood River, Old Alton–Edwardsville Road (with a concurrency with then-IL 159), and up Broadway in Alton until its concurrency with US 67 using Belle Street.
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