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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.