Illinois Route 40

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Illinois Route 40

IL 40 highlighted in red
Route information
Maintained by IDOT
Length112.05 mi[1] (180.33 km)
ExistedNovember 5, 1918[2]–present
Major junctions
South end I-74 / IL 29 in East Peoria
Major intersections I-74 in Peoria
US 150 in Peoria
US 6 / US 34 in Sheffield
I-80 in Sheffield

I-88 / IL 110 (CKC) in Rock Falls
US 30 in Rock Falls
North end IL 78 in Mount Carroll
CountryUnited States
CountiesTazewell, Peoria, Marshall, Stark, Bureau, Whiteside, Carroll
Highway system
US 40 I-41
I-88Illinois 88.svg IL 89

Illinois Route 40 (IL 40) is a 112.05-mile-long (180.33 km) north–south route in central portion of the U.S. state of Illinois. It runs from Interstate 74 (I-74) in East Peoria north to IL 78 at Mt. Carroll, just south of U.S. Route 52 (US 52) and IL 64.[1]

Route description

Bob Michel Bridge carrying Illinois Route 40 over the Illinois River.

Illinois 40 is known as Knoxville Avenue in the Peoria area, generally south of Illinois Route 6. Route 40 crosses over Interstate 74 north of downtown, and then grows complex in the downtown area, as there are three turns in a one-block length. Illinois 40 then emerges onto William Kumpf Boulevard and crosses over the Illinois River using the Bob Michel Bridge. On the other side of the river, Illinois 40 is briefly called Washington Street. It then is routed onto an onramp to Interstate 74, where there is an exit to Camp Street before terminating at I-74.


Originally, SBI Route 40 ran from Sterling to Stockton.[3] In 1935, IL 40 got cut back to Mount Carroll in favor of IL 78.[4] By 1938, Illinois Route 88 entirely acquired IL 40 north of Sterling.[5] In 1987, Illinois Route 5, a four-lane freeway which crosses Illinois 40, was designated Interstate 88 east of I-80.[6] As of 1995, IDOT redesignated Illinois 88 as Illinois 40 to prevent confusion.[7] Although the new number is also the number of a Federal Highway that passes through Illinois (U.S. Route 40), a great enough distance exists between them that the possibility of confusing one for the other is negligible.

IL 40 in Peoria County, north of IL 90

Prior to 2003, the Illinois 40 exit on I-74 southeast of Peoria was called "Industrial Spur". As part of the Upgrade 74 Project, the exit was renamed by the Illinois Department of Transportation to Riverfront Drive.

Major intersections

TazewellEast Peoria0.00.0 I-74 / IL 29 – Peoria, BloomingtonSouthern terminus; I-74 exit 94
0.30.48Camp StreetInterchange; southbound exit and entrance
0.40.64W. Washington Street east – East PeoriaInterchange; left entrance northbound, left exits
Illinois River0.81.3Bob Michel Bridge
PeoriaPeoria2.54.0 I-74 – Galesburg, BloomingtonI-74 exits 92A–B
4.47.1 US 150 (War Memorial Drive)

IL 6 to I-74 / I-474 – Chillicothe
IL 6 exit 6
IL 90 west (Truitt Road)
IL 17 east
South end of IL 17 concurrency
IL 17 west
North end of IL 17 concurrency
IL 93 west
Bureau51.282.4 US 6 (Grand Army of the Republic Highway) / US 34 (Walter Payton Memorial Highway)
52.885.0 I-80 – Moline, Rock Island, JolietI-80 exit 45
64.9104.4 IL 92
IL 172 south (Star Road)
I-88 / IL 110 (CKC) (Ronald Reagan Memorial Highway) – Moline, Rock Island, Dixon
I-88 exit 41
Rock Falls78.9127.0 US 30 (Rock Falls Road)

IL 2 north / Lincoln Highway east (3rd Street, 4th Street)
Lincoln Highway west (5th Street)
CarrollMount Carroll112.05180.33 IL 78 (Clay Street)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08.
  2. ^ Carlson, Rick (2006-03-15). "Illinois Highways Page: Routes 21 thru 40". Retrieved 2006-03-28.
  3. ^ Illinois Secretary of State; Rand McNally (1934). Official Road Map Illinois (Map). [c. 1:950,000 and c. 1:1,110,000]. Springfield: Illinois Secretary of State. OCLC 183709045 – via Illinois Digital Archives.
  4. ^ Illinois Secretary of State; H.M. Gousha (1935). Official Road Map Illinois (Map). [c. 1:950,000 and c. 1:1,110,000]. Springfield: Illinois Secretary of State. Retrieved August 16, 2020 – via Illinois Digital Archives.
  5. ^ Illinois Secretary of State; Rand McNally (1939). Illinois Road Map (Map) (1939–1940 ed.). c. 1:918,720. Springfield: Illinois Secretary of State – via Illinois Digital Archives.
  6. ^ Mehler, Neil H. (July 6, 1987). "Road with Many Names Gets a New One". Chicago Tribune.
  7. ^ Illinois Department of Transportation (1995). Illinois Highway Map (Map) (1995–1996 ed.). [1:762,500]. Springfield: Illinois Department of Transportation – via Illinois Digital Archives.
  8. ^ Google Maps, [1] Archived 2008-02-20 at the Wayback Machine