Interstate 474

Interstate 474 (I-474) is an Interstate Highway loop route that provides a southwestern bypass around the north-central Illinois city of Peoria. I-474's parent Interstate is I-74. As the first digit of the Interstate's number is even, it follows the established convention of providing a loop around a city. I-474 is 14.88 miles (23.95 km) long. I-474 is the highest numbered route in the state of Illinois.[1] It is also, excluding the proposed I-274 in North Carolina, the only auxiliary route of I-74.

Interstate 474 marker

Interstate 474

I-474 highlighted in red
Route information
Auxiliary route of I-74
Maintained by IDOT
Length14.88 mi[1] (23.95 km)
Existed1979[2][3]–present
NHSEntire route
Major junctions
West end I-74 / IL 6 in Peoria
Major intersections US 24 in Bartonville
US 24 in Creve Coeur
East end I-74 in East Peoria
Location
CountryUnited States
StateIllinois
CountiesPeoria, Tazewell
Highway system
← IL 394→ I-490

Route description
Shade–Lohmann Bridge from the southeast

I-474 is a modern, Interstate-standard four-lane freeway for its entire length. Prior to 2006, through truck traffic on I-74 was instructed to use I-474. This is because prior to its 2004–2007 reconstruction, I-74 was significantly below Interstate standard, having numerous 15-mile-per-hour (24 km/h) on- and offramps, extremely short merging space for onramps (some less than 500 feet (150 m) in length),[4] and a 50-mile-per-hour (80 km/h) speed limit through downtown Peoria.

The Illinois Route 116 (IL 116) access interchange at Maxwell Road has been indicated as the eastern terminus for the Quincy to Peoria expressway now known as the IL 336 project.[5]

The western terminus of I-474 is at I-74 exit 87A. The eastern terminus of I-474 is at I-74 exit 99. North of the western terminus, the road continues as IL 6 with a new series of exit numbers.

History

I-474 was constructed through the mid-1970s. The now-named Shade–Lohmann Bridge was erected in 1973. During that year, $30.1 million (equivalent to $142 million in 2021[6]) was allocated for acquisition of right-of-way, grading work, and overpass/bridge construction across the whole length of the highway.[7]

Exit list
CountyLocationmikmExitDestinationsNotes
Peoria​0.000.00
 IL 6 north – Chillicothe		Continuation north beyond I-74
0 I-74 – Peoria, Moline, Rock IslandWestern terminus; signed as exits 0A (east) and 0B (west); I-74 exit 87A
Bellevue3.786.083A
 To IL 116 – Farmington
​5.348.595 CR R49 (Airport Road)Serves Peoria International Airport
Bartonville–Peoria line7.0911.416
 US 24 west (Adams Street) – Bartonville		West end of US 24 overlap; signed as exits 6A (US 24 west) & 6B (Adams Street) westbound
Illinois River8.83–
9.04		14.21–
14.55		Shade–Lohmann Bridge
TazewellCreve Coeur9.5715.409
 US 24 east / IL 29 – East Peoria, Pekin		East end of US 24 overlap
East Peoria14.8823.9515

 I-74 to I-155 south – Peoria, Indianapolis, Lincoln		Eastbound exit and westbound entrance; eastern terminus and signed as exit 15 (west); I-74 exit 99
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References
  1. Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved November 8, 2007.
  2. Illinois Department of Transportation (1979). Illinois Highway Map (Map). [1:772,500]. Springfield: Illinois Department of Transportation. Retrieved November 24, 2022 – via Illinois Digital Archives.
  3. Kurumi. 3-digit Interstates from I-74. Last updated November 24, 2005. Retrieved March 27, 2006.
  4. "USGS Map of Peoria, Illinois" (Map). ngmdb.usgs.gov. Retrieved September 22, 2020.
  5. Illinois Department of Transportation. Image of eastern end of project maps from Peoria to Macomb IDOT site. Retrieved March 27, 2006.
  6. Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved January 1, 2023. United States Gross Domestic Product deflator figures follow the Measuring Worth series.
  7. R.L. Polk and Company (1973), Polk's Peoria City Directory, R.L. Polk and Co. Publishers
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