Illinois Route 121
Illinois Route 121 (IL 121) is a 109.48-mile-long (176.19 km) major state highway in the central part of the U.S. state of Illinois. Although it travels from northwest to southeast, it is marked as a north–south highway. It travels from IL 130 in Greenup (very near U.S. Route 40) to Interstate 55 (I-55) in Lincoln at the interchange of I-55 and IL 10.
Illinois Route 121
|Maintained by IDOT|
|Length||109.48 mi (176.19 km)|
|Counties||Cumberland, Coles, Moultrie, Macon, Logan|
From there, it travels northwest into the city limits of Decatur but largely goes around downtown using 22nd Street and Pershing Road. On the northwest side of Decatur, IL 121 intersects with the concurrent I-72 and US 51.
IL 121 continues further northwest into Lincoln, where it has a concurrency with IL 10 through Lincoln as Keokuk Street and Woodlawn Road before terminating at I-55 just south of I-155. IL 10 continues west on the same road.
State Bond Issue (SBI) Route 121 formerly traveled from Peoria to the Indiana state line east of Chrisman. When US 36 was established in the late 1920s, IL 121 was dropped east of Decatur. In March 1937, IL 121 replaced then IL 131 and IL 132 south of Decatur to Greenup.
In 1993, I-155 north of Lincoln was completed. IL 121 was then dropped from this stretch of freeway.
|||19.0||30.6||South end of US 45 concurrency|
|Coles||Mattoon||23.6||38.0||I-57 exit 184|
|27.4||44.1||South end of IL 16 concurrency|
|27.4||44.1||North end of IL 16 concurrency|
|28.0||45.1||North end of US 45 concurrency|
|Moultrie||Sullivan||44.4||71.5||South end of IL 32 concurrency|
|||45.8||73.7||North end of IL 32 concurrency|
|Macon||Decatur||67.3||108.3||South end of US 36 concurrency|
|70.4||113.3||North end of US 36 concurrency; south end of IL 105 concurrency|
|70.6||113.6||North end of IL 105 concurrency|
|72.7||117.0||South end of IL 48 concurrency|
|75.3||121.2||North end of IL 48 concurrency|
|77.5||124.7||I-72 exit 138|
|Lincoln||105.5||169.8||South end of IL 10 concurrency|
|105.9||170.4||1930-1940 Historic US 66|
|106.1||170.8||1930-1940 Historic US 66|
|109.48||176.19||Northern terminus; north end of IL 10 concurrency; I-55 exit 126|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
U.S. Roads portal Illinois portal
- Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08.
- Carlson, Rich. Illinois Highways Page: Routes 121 thru 140. Last updated March 15, 2005. Retrieved May 9, 2006.
- Sarjeant, Charles. Illinois 121. Retrieved May 9, 2006.
- "State Highway Markings to be Changed". The Journal Gazette. March 29, 1937. p. 1. Retrieved December 12, 2016 – via Newspapers.com.
- Google (March 2, 2017). "Overview Map of IL 121" (Map). Google Maps. Google. Retrieved March 2, 2017.