Illinois Route 123

Illinois Route 123
Route information
Maintained by IDOT
Length	33.72 mi[1] (54.27 km)
Existed	1924[2] – present
Major junctions
West end	IL 125 in Pleasant Plains
East end	I-55 in Williamsville
Location
Counties	Sangamon, Menard
Highway system
Illinois State Highway System Interstate U.S. State Tollways ← IL 122 IL 124 →

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 Interstate 55 exit #109 at Williamsville to Illinois Route 125 near Pleasant Plains.

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

County	Location	mi[3]	km	Destinations	Notes
Menard	​	0.00	0.00	IL 125 – Beardstown, Springfield	Western terminus of IL 123
		9.4	15.1	IL 97 south	Southern end of IL 97 concurrency
	Petersburg	14.4	23.2	IL 97 north	Northern end of IL 97 concurrency
	​	21.3	34.3	IL 29 north – Peoria	Northern end of IL 29 concurrency
Sangamon	Fancy Creek Township	27.0	43.5	IL 29 south – Springfield	Southern end of IL 29 concurrency
		30.6	49.2	IL 124 east – Sherman	Western terminus of IL 124
	Williamsville	33.72	54.27	I-55 / Historic US 66 west – Springfield, Lincoln	Eastern terminus of IL 123
				Historic US 66 east – Lincoln	Continuation beyond IL 123
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

References