Illinois Route 121

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Illinois Route 121 marker

Illinois Route 121
Route information
Maintained by IDOT
Length: 109.48 mi[2] (176.19 km)
Existed: 1924[1] – present
Major junctions
Southeast end: IL 130 in Greenup
 
Northwest end: IL 10 / I-55 in Lincoln
Location
Counties: Cumberland, Coles, Moultrie, Macon, Logan
Highway system
IL 120 IL 122

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.

Route description[edit]

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[edit]

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.[1]

Major intersections[edit]

County Location mi[5] km Destinations Notes
Cumberland Greenup 0.0 0.0 IL 130
19.0 30.6 US 45 south South end of US 45 concurrency
Coles Mattoon 23.6 38.0 I-57 – Effingham, Champaign Exit 184 (I-57)
27.4 44.1 IL 16 east – Charleston South end of IL 16 concurrency
27.4 44.1 IL 16 west – Shelbyville North end of IL 16 concurrency
28.0 45.1 US 45 north – Arcola North end of US 45 concurrency
Moultrie Sullivan 44.4 71.5 IL 32 south – Effingham South end of IL 32 concurrency
45.8 73.7 IL 32 north – Lovington North end of IL 32 concurrency
Dalton City 58.8 94.6 IL 128 south – Shelbyville
Macon Decatur 67.3 108.3 US 36 east – Tuscola South end of US 36 concurrency
70.4 113.3 US 36 west / IL 105 west – Springfield North end of US 36 concurrency; south end of IL 105 concurrency
70.6 113.6 IL 105 east – Monticello North end of IL 105 concurrency
72.7 117.0 IL 48 north – Argenta South end of IL 48 concurrency
74.3 119.6
US 51 Bus. north (Water Street) – Bloomington, Clinton
One-way pair
74.4 119.7
US 51 Bus. south (Main Street) – Macon, Pana
One-way pair
75.3 121.2 IL 48 south – Taylorville North end of IL 48 concurrency
77.5 124.7 I-72 – Springfield, Pana, Champaign, Bloomington Exit 138 (I-72)
Logan Mt. Pulaski 94.3 151.8 To IL 54 – Clinton, Springfield
Lincoln 105.5 169.8 IL 10 east – Clinton South end of IL 10 concurrency
107.6 173.2 I-55 Bus. (Lincoln Parkway)
109.48 176.19 I-55 / IL 10 west – Springfield, Peoria, Bloomington North end of IL 10 concurrency; Exit 126 (I-55)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also[edit]

References[edit]

  1. ^ a b Carlson, Rich. Illinois Highways Page: Routes 121 thru 140. Last updated March 15, 2005. Retrieved May 9, 2006.
  2. ^ Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08. 
  3. ^ Sarjeant, Charles. Illinois 121. 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.  open access publication – free to read
  5. ^ Google (March 2, 2017). "Overview Map of IL 121" (Map). Google Maps. Google. Retrieved March 2, 2017.