Interstate 270 West

The first confirming marker for Interstate 270 stands just west of the exchange with I-55/70. 50.6 miles in length, the northern and western bypass of St. Louis wraps around the metropolitan area to I-55 and I-255 near Mehlville.

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Posted two miles out from IL 159, this sign references Columbia at 135 miles and Kansas City at 267 miles. Both control cities are located along the Interstate 70 corridor in Missouri.

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IL 159 (Troy Road) constitutes a 62 mile long route running between Red Bud and Bunker Hill in western Illinois.

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Interstate 270 travels through the village of Glen Carbon between I-55/70 and I-255/IL 255.

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The village of Maryville lies south of Glen Carbon along IL 159.

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IL 159 stems south from the upcoming diamond interchange at Exit 12 to Collinsville, which lies south beyond I-55/70. The Edwardsville city limits are 1.8 miles to the north of I-270.

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Interstate 270 west reaches Exit 12 at the Oaklawn Road overpass. IL 159 meets I-55/70 at a cloverleaf interchange 3.3 miles to the south of Exit 12 en route to Collinsville.

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The succeeding exit west of IL 159 joins I-270 with IL 157 to Collinsville and Edwardsville.

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Exit 9 leaves I-270 west for IL 157 (Bluff Road). Equidistant from Interstate 270, Collinsville lies 5.4 miles to the south while Downtown Edwardsville is 5.4 miles to the northeast. The exchange with I-255 south and IL 255 north follows in two miles.

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Interstate 270 west rises onto bluffs ahead of the diamond interchange (Exit 9) with IL 157.

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The directional cloverleaf interchange (Exits 7 B/A) joining I-270 with I-255/IL 255 is one mile west of Sand Road. The succeeding exit is for IL 111 while Columbia and Kansas City, Missouri lie 130 and 262 miles ahead, respectively.

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The control city for IL 255 changed from Wood River to the city of Alton after the 20.50 mile long freeway was completed to U.S. 67 north of Alton in October 2012.

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Exit 7 B departs I-270 west for the freeway along IL 255 north from Edwardsville to Roxana, Wood River and Bethalto. IL 255 bypasses Alton to northeast en route to U.S. 67 at Godfrey.

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Exit 7 A loops away from I-270 west for Interstate 255 south to Caseyville, Centreville and Columbia. Located 302 miles to the south, Memphis, Tennessee can be reached via I-255 south to I-55 south from Mehlville, Missouri.

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I-270 continues one mile west from I-255/IL 255 to the cloverleaf interchange (Exits 6 B/A) with IL 111 in the village of Pontoon Beach.

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An auxiliary lane opens along westbound I-270 from I-255/IL 255 to Exit 6 B for IL 111 north to Edwardsville, South Roxana and Hartford.

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IL 111 extends north from Roxana into the city of Wood River and the village of Bethalto before turning west to the city of Alton.

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Heading south through Pontoon Beach, IL 111 continues to Fairmont, Washington Park and Lake Drive in Centreville.

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The Great River Road system follows I-270 west from IL 111.

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Since renamed to Worldwide Technology Raceway, Gateway Motorsports Park is located in the city of Madison adjacent to IL 203 and I-55/70.

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IL 203 is the first of three exits from Interstate 270 west for Granite City. IL 203 concludes at Exit 4 where Chain of Rocks Road turns east into the community of Mitchell.

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Separated by N and W Railroad tracks, folded diamond interchanges join I-270 with IL 203 (Chain of Rocks Road) and parallel Old Alton Road.

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Old Alton Road leads north to the village of Hartford and south into Granite City.

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Interstate 270 arcs northward across a levee system between Cedar Park and Saint Thomas.

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The Great River Road system continues from I-270 along IL 3 from Exit 3.

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IL 3 runs along the west side of Granite City and extends northward paralleling the Mississippi River to Hartford and Wood River.

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The Lewis and Clark (Camp River Dubois) State Historic Site lies north of Exit 4 along IL 3 in Hartford.

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IL 3 generally follows the Mississippi River northward from U.S. 51/SR 37 at Cairo to IL 100 in Grafton. Locally IL 3 runs north to Alton and Godfrey and south to East St. Louis and Columbia.

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The six-ramp parclo interchange linking I-270 and IL 3 originally was a full cloverleaf with loop ramps along southbound IL 3.

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Interstate 270 ascends across Chain of Rocks Canal just west of IL 3.

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Chain of Rocks Canal separates Chouteau Island from Granite City to the east.

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Interstate 270 navigates through an S-curve across Chouteau Island and northern reaches of the Madison city limits.

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Exit 34 connects Interstate 270 at the west end of the New Chain of Rocks Bridge with Riverview Drive and Highway H in the city of St. Louis.

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Interstate 270 curves northwest to cross the Mississippi River.

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The Missouri Welcome Center along Dunn Road adjacent to I-270 and Exit 34 closed in 2020 in an effort by the Missouri Division of Tourism to cut costs during the pandemic. The state razed the site in Summer 2022 at a cos of $32,500.¹

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The New Chain of Rocks Bridge was completed in 1966.²

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$532 million in construction for the replacement of the Chain of Rocks Bridge commenced on June 15, 2023. Under the jurisdiction of IDOT, work builds twin bridges with full shoulders and the capacity to accommodate future widening of I-270.²

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