Interstate 255 Missouri / Illinois

Interstate 255 Missouri
Mehlville, MO ↔ Pontoon Beach, IL•30.82 miles

Overview

Forming the eastern third of a beltway around the metropolitan St. Louis, Interstate 255 provides a bypass route for I-55 and I-70 traffic. The freeway angles east from Mehlville, Missouri across the Jefferson Barracks Bridge over the Mississippi River to Columbia, Illinois. IL 3 ties into I-255 there as an expressway north from Waterloo. The two overlap north to Dupo before separating on respective courses north to Cahokia and northeast to Alorton.

Interstate 255 serves as a commuter route northward by St. Louis Downtown Airport (CPS) to I-64 at Caseyville and I-55/70 at Collinsville. U.S. 50 accompanies the freeway north from I-270 in Mehlville to I-64 east to O'Fallon. Beyond Collinsville, I-255 turns north to Pontoon Beach and a rural junction with I-270 and IL 255 north to Godfrey.

I-255 south Jefferson Barracks Bridge
I-255/U.S. 50 span the Mississippi River west from the American Bottoms area north of Columbia, Illinois to unincorporated Mehlville, Missouri. The tied arch bridges are named after the adjacent Jefferson Barracks National Cemetery. Photo by Joel Wade (04/16/05).
IL 3 north at I-255 - Columbia
IL 3 north at the three-wye interchange with Interstate 255 in the city of Columbia. Photo by Joel Wade (04/16/05).

Mileage by State

Missouri3.77 mi
Illinois27.05 mi

Data Sources

December 31, 2021 Interstate Route Log and Finders List

History

The recommended Interstate Marking for the St. Louis Urban Area approved by the American Association of State Highway Officials (AASHO) on November 10, 1958 outlined Interstate 255 along the Easterly route from I-55 at Mehlville, Illinois to I-55/70 at Collinsville. I-270 north from Mehville to I-70 at Bridgeton was numbered as Interstate 244, with I-270 designated on the North Beltway only.1 Construction on the I-255 portion in Missouri got underway in 1962. It was completed in 1969.2

Changes made to the St. Louis area numbered route system in 1974 included the relocation of U.S. 50 over what was previously designated as U.S. 50 Bypass, from Sunset Hills, Missouri to Fairview Heights, Illinois. The elimination of U.S. 50 Bypass coincided with the relocation of the U.S. 50 mainline onto I-255 from Illinois 3 south of Cahokia to Lindbergh Boulevard at Mehlville. Also approved by the American Association of State Highway and Transportation (AASHTO) on June 25, 1974 was the renumbering of both I-244 and I-255 as an extended I-270.

Illinois and Missouri opted to restore Interstate 255 along the beltway east from south St. Louis County to Glen Carbon in 1979. Twin tier arched bridges, the Jefferson Barracks Bridge carrying I-255/U.S. 50 westbound across the Mississippi River opened initially with one span in July 1984. The eventual eastbound bridge opened to traffic on December 3, 1990.3

Interstate 255 was completed from the Jefferson Barracks Bridge northeast to I-55/70 in 1986. During that time, state officials successfully convinced the federal government to lengthen the route another six miles to meet Interstate 270 northeast of Pontoon Beach.4 This extension was completed on March 15, 1988 and it included provisions for the eventual IL 255 freeway leading north to Alton.5

Mileage by State

Missouri3.77 mi
Illinois27.05 mi

Data Sources

December 31, 2021 Interstate Route Log and Finders List

Illinois Route 255

Although Interstate 255 ends at I-270, the freeway continues north of I-270 as IL 255. Planning for the route commenced in 1988 as I-255 was nearing completion. However the Alton Bypass was not part of federal highway plans, so funding for it would come at the state level.6

The first portion of the freeway along IL 255 constructed was the 6.8 mile extension from I-255 north to IL 143 (Edwardsville Road). It opened in October 1998 at a cost of $88.7 million. Estimations for the continuation of the freeway north to Godfrey ballooned to $200 million, leading to skepticism that it would ever be built. Lobbying by the Committee For Completion of Highway 255 ushered the public behind the effort, leading to the May 1999 allocation of $180 million for IL 255 by Governor George Ryan.6

Work was slow to begin, and the 7.6 mile $78.1 million stretch between IL 143 and Fosterburg Road in Alton opened in October 2006.6 Construction progressed from there on a $25.1 million 2.75 mile segment to Seminary Road. It was completed in August 22, 2008.7

The next stage of construction kicked off in May 2010 on a $21.9 million project involving 3.4 miles of new roadway to U.S. 67 in Godfrey.6 The freeway opened between Seminary Road and Humbert Road at Godfrey on October 26, 2012 and from Humbert Road to IL 111 (Montclaire Avenue on November 21, 2012.7 This left final work on the "Godfrey Y", the wye interchange with U.S. 67 leading northwest to Jerseyville, which was fully opened by mid July 2013.8 The entire IL 255 corridor is envisioned as the southern leg of a planned four lane route along U.S. 67 linking the St. Louis area with the Quad Cities.7

Since the freeway was constructed with state funds, it is not a candidate for Interstate status. However, that also depends upon whether an Interstate grade facility is constructed along U.S. 67, as some Western Illinois politicians have wanted for years.

The Missouri Department of Transportation (MODOT) replaced signs throughout the Saint Louis region from Winter 2000 to 2002 with newer style retroreflective sign panels. By late 2001, I-255 and I-270 in Missouri were dedicated the "American Veterans Memorial Highway".

North End Interstate 270 Illinois Route 255 ‐ Pontoon Beach, IL

Interstate 255 North at Interstate 270 Illinois Route 255

I-255 north at I-270 - Pontoon Beach, IL

I-255 bends northwest through eastern reaches of Pontoon Beach to IL 162 and Interstate 270 at Exit 30. 05/24/18

I-255 north at I-270 - Pontoon Beach, IL I-255 north at I-270 - Pontoon Beach, IL I-255 north at I-270 - Pontoon Beach, IL I-255 north at I-270 - Pontoon Beach, IL

Illinois Route 255 South at Interstate 255 Interstate 270

IL 255 south at I-255/270 - Edwardsville, IL

Crossing over Gateway Commerce Center Drive, IL 255 advances one mile south to the directional cloverleaf interchange with I-270 and I-255 south. 05/24/18

IL 255 south at I-255/270 - Edwardsville, IL IL 255 south at I-255/270 - Edwardsville, IL IL 255 south at I-255/270 - Edwardsville, IL IL 255 south at I-255/270 - Edwardsville, IL IL 255 south at I-270 east to Glen Carbon, Illinois

Interstate 270 West at Interstate 255 Illinois Route 255

I-270 west at Exit 9, two miles from I-255/IL 255 at Glen Carbon, Illinois

Interstate 270 meets I-255 north and IL 255 south two miles west of Exit 9 for IL 157 in the village of Glen Carbon. 12/31/23

I-270 west at Exit 9, two miles from I-255/IL 255 at Glen Carbon, Illinois Sand Rd spans I-270 one mile east of Exit 7 to I-255/IL 255 I-270 west at IL 255 north to Alton and Godfrey, Illinois Exit 7 A departs from I-270 west for I-255 south to Caseyville, IL

Interstate 270 East at Interstate 255 Illinois Route 255

I-270 east at I-255/IL 255 - Pontoon Beach, IL

Interstate 270 progresses 0.75 miles east from the cloverleaf interchange (Exit 6) with IL 111 in north Pontoon Beach to I-255 south and IL 255 north. 05/03/12

I-270 east at I-255/IL 255 - Pontoon Beach, IL I-270 east at I-255/IL 255 - Pontoon Beach, IL I-270 east at I-255/IL 255 - Pontoon Beach, IL

South End Interstate 55 Interstate 270 ‐ Mehlville, MO

Interstate 255 West at Interstate 55 Interstate 270

I-255 west at U.S. 50/61/67, 0.75 miles from I-55/270 at Mehlville, MO

U.S. 50 (Lindbergh Boulevard) separates from Interstate 255 west to join the freeway with U.S. 61/67 through Mehlville. I-255 passes by South County Center mall to meet I-70 and I-270 over the ensuing mile. 12/31/23

I-255 west at U.S. 50/61/67, 0.75 miles from I-55/270 at Mehlville, MO I-255 advances west from Lemay Ferry Rd to Exit 1 for I-55 Exit 1 B departs I-255 west for I-55 north to St. Louis, Missouri Exit 1 A loops onto I-55 south toward Memphis, Tennessee

Interstate 270 East at Interstate 55 Interstate 255

I-270 south at I-55/255 - Concord, MO

Interstate 270 advances east from Missouri Route 21 through unincorporated Concord to I-255. MODOT typically signs the ends of Interstates and other major freeways with this style of sign. Photo by Eric Stuve (09/22/15).

I-270 south at I-55/255 - Concord, MO I-270 south at I-55/255 - Concord, MO I-270 south at I-55/255 - Concord, MO I-270 east at I-55/255 - 2002

Interstate 55 North at Interstate 255 Interstate 270

I-55 north at I-255/270 - Mehlville, MO

Interstate 55 ultimately expands to six northbound lanes leading into the multi level interchange (Exits 196A/B) with I-255/270 at Mehlville. 12/20/09

I-55 north at I-255/270 - Mehlville, MO I-55 north at I-255/270 - Mehlville, MO I-55 north at I-255/270 - Mehlville, MO I-55 north at I-255/270 - Mehlville, MO I-55 north at I-255/270 - Mehlville, MO

Interstate 55 South at Interstate 255 Interstate 270

I-55 south at I-255/270 - Affton, MO

A c/d roadway to I-255/270 and U.S. 61-67-50 (Lindbergh Boulevard) separates from I-55 south two miles beyond Reavis Barracks Road at Affton. 04/13/13

I-55 south at I-255/270 - Affton, MO I-55 south 1.25 miles ahead of I-255/270 at Mehlville, Missouri Three lanes separate from I-55 south for I-255/270 and U.S. 50/61/67 Exit 197 partitions for U.S. 50/61/67 and the distributor roadway to I-255/270 Ramps from I-55 east to I-255 also connect with U.S. 61/67

References

  1. Summers, S. MISO (Missouri Interstate Route Numbering). Interstate system route numbering web site. Retrieved from http://nwindianahwys.homestead.com/MISO.html
  2. July 26, 1988 - A ceremony on I-255 north of Granite City marked the completion of the Interstate loop around St. Louis, Construction on the Missouri side began in 1962, and was finished by 1969. The 38-mile Missouri loop was divided into I-270, 244 and 255. In 1974, officials considered naming the whole thing after John F. Kennedy, then decided to designate it as 270 on the Missouri side, 255 in Illinois. [Facebook update].
  3. "Jefferson Barracks Bridge Opens...Crowd Braves Harsh Wind To Watch Span's Dedication." St. Louis Post-Dispatch (MO), December 4, 1990.
  4. "I-255 Rim Means Loop is Finished - For Now." St. Louis Post-Dispatch (MO), July 31, 1988.
  5. "One-Mile Piece of I-255 Will Open Today." St. Louis Post-Dispatch (MO), March 15, 1988.
  6. "Metro East area is in the loop - 21-mile, four-lane freeway will arc from I-270 and link to U.S. 67 near Godfrey." St. Louis Post-Dispatch (MO), July 14, 2010.
  7. "Illinois 255 extends its reach to Godfrey." Edwardsville Intelligencer (IL), August 26, 2008.
  8. "Illinois 255 opens to Godfrey 'Y'." The Telegraph (Alton, IL), November 22, 2012.
  9. "Routes 67 and 255 Come Together." Alton Daily News.com (IL), July 19, 2013.
Updated January 28, 2024