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.[3] 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
Route information
Maintained by IDOT
Length109.48 mi[1] (176.19 km)
Existed1924[2]–present
Major junctions
Southeast end IL 130 in Greenup
 
Northwest end I-55 / IL 10 in Lincoln
Location
CountiesCumberland, Coles, Moultrie, Macon, Logan
Highway system
Illinois State Highway System
← IL 120IL 122 →

Route description

IL 121 travels north from Greenup near I-70. While traveling northwest, IL 121 travels through Toledo and has an interchange with I-57 in Mattoon.

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.

History

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.[4]

In 1993, I-155 north of Lincoln was completed. IL 121 was then dropped from this stretch of freeway.

IL 121 had a business route through Decatur until about 1980 along Main Street and Water Street. This was replaced by US 51 Business.[2]

Major intersections
CountyLocationmi[5]kmDestinationsNotes
CumberlandGreenup0.00.0 IL 130
​19.030.6 US 45 southSouth end of US 45 concurrency
ColesMattoon23.638.0 I-57 – Effingham, ChampaignI-57 exit 184
27.444.1 IL 16 east – CharlestonSouth end of IL 16 concurrency
27.444.1 IL 16 west – ShelbyvilleNorth end of IL 16 concurrency
28.045.1 US 45 north – ArcolaNorth end of US 45 concurrency
MoultrieSullivan44.471.5 IL 32 south – EffinghamSouth end of IL 32 concurrency
​45.873.7 IL 32 north – LovingtonNorth end of IL 32 concurrency
Dalton City58.894.6 IL 128 south – Shelbyville
MaconDecatur67.3108.3 US 36 east – TuscolaSouth end of US 36 concurrency
70.4113.3 US 36 west / IL 105 west – SpringfieldNorth end of US 36 concurrency; south end of IL 105 concurrency
70.6113.6 IL 105 east – MonticelloNorth end of IL 105 concurrency
72.7117.0 IL 48 north – ArgentaSouth end of IL 48 concurrency
74.3119.6
US 51 Bus. north (Water Street) – Bloomington, Clinton		One-way pair
74.4119.7
US 51 Bus. south (Main Street) – Macon, Pana		One-way pair
75.3121.2 IL 48 south – TaylorvilleNorth end of IL 48 concurrency
77.5124.7 I-72 / US 51 – Springfield, Pana, Champaign, BloomingtonI-72 exit 138
LoganMt. Pulaski94.3151.8 To IL 54 – Clinton, Springfield
Lincoln105.5169.8 IL 10 east – ClintonSouth end of IL 10 concurrency
105.9170.4 I-55 Bus. north (Kickapoo Street) / Historic US 66 east1930-1940 Historic US 66
106.1170.8 I-55 Bus. south (Logan Street) / Historic US 66 west1930-1940 Historic US 66
107.6173.2 Historic US 66 (Lincoln Parkway)
109.48176.19 I-55 to I-155 north – Bloomington, Springfield, Peoria
IL 10 west – Mason City		Northern terminus; north end of IL 10 concurrency; I-55 exit 126
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also
  • U.S. Roads portal
  • Illinois portal

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. Sarjeant, Charles. Illinois 121 Archived 2011-09-06 at the Wayback Machine. Retrieved May 9, 2006.
  4. "State Highway Markings to be Changed". The Journal Gazette. March 29, 1937. p. 1. Retrieved December 12, 2016 – via Newspapers.com.
  5. Google (March 2, 2017). "Overview Map of IL 121" (Map). Google Maps. Google. Retrieved March 2, 2017.
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