Illinois Route 123

Illinois Route 123 (IL-123) is an east–west state highway in central Illinois, USA. 33.72 miles (54.27 km) long,[1] it stretches from Historic Route 66 at Williamsville[3] to Illinois Route 125 near Pleasant Plains.

Illinois Route 123
IL 123 highlighted in red
Route information
Maintained by IDOT
Length33.72 mi[1] (54.27 km)
Existed1924[2]–present
Major junctions
West end IL 125 in Pleasant Plains
  I-55 in Williamsville
East end Historic US 66 in Williamsville
Location
CountiesSangamon, Menard
Highway system
Illinois State Highway System
← IL 122→ IL 124

Route description

All of IL-123's route is contained within Sangamon and Menard counties. Major towns located on or adjacent to IL-123 include Athens, Petersburg, and Williamsville.

New Salem, the home of Abraham Lincoln in the 1830s, has been reconstructed as Lincoln's New Salem State Historic Site near Petersburg on IL-123.

History

SBI Route 123 was what Illinois 123 is now, plus a road from Ashland south to Alexander at Interstate 72/U.S. Route 36. In 1999, Illinois 123 was truncated on its southern end to Illinois 125. In October 2003, Illinois 123 was extended east to Williamsville, replacing some of Illinois Route 124 in the process as well as all of Sangamon County Route 11.[2]

Major intersections
CountyLocationmi[4]kmDestinationsNotes
Menard​0.000.00 IL 125 – Beardstown, SpringfieldWestern terminus of IL 123
9.415.1 IL 97 southSouthern end of IL 97 concurrency
Petersburg14.423.2 IL 97 northNorthern end of IL 97 concurrency
​21.334.3 IL 29 north – PeoriaNorthern end of IL 29 concurrency
SangamonFancy Creek Township27.043.5 IL 29 south – SpringfieldSouthern end of IL 29 concurrency
30.649.2 IL 124 east – ShermanWestern terminus of IL 124
Williamsville33.7254.27 I-55 / Historic US 66 west – Springfield, LincolnWest end of Historic US 66 overlap
34.054.7 Historic US 66 east – LincolnEastern terminus of IL 123; east end of Historic US 66 overlap
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References
  1. Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08.
  2. Carlson, Rich. Illinois Highways Page: Routes 121 thru 140. Last updated March 15, 2005. Retrieved May 9, 2006.
  3. Google (October 3, 2020). "Street view of the eastern terminus of IL 123" (Map). Google Maps. Google. Retrieved October 3, 2020.
  4. Google (March 2, 2017). "Overview Map of IL 123" (Map). Google Maps. Google. Retrieved March 2, 2017.
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