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Illinois Department of Transportation

I-270 Preliminary Engineering Study

The Illinois Department of Transportation (IDOT) is conducting a Phase I Engineering study of I-270 from Riverview Drive in St. Louis, Missouri to Illinois Route 157 in Madison County, Illinois.

Note: IDOT projects typically have three distinct phases. Phase I (or the project Study) consists of developing the project scope, environmental studies and preliminary design of a project. Phase II (Design) consists of refining the design to develop contract plans and land acquisition. Phase III (Construction) consists of the actual construction of the project.

Study

Construction

IDOT is currently at the early stages of Phase I for this project. As we make changes, this website will be updated accordingly.

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Illinois Department of
Transportation
Hanley Building
2300 S. Dirksen Parkway
Springfield, IL 62764

(217) 782-7820 or
TTY (866) 273-3681

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