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Illinois Department of Transportation

Schedule

IDOT’s Project Development Process

IDOT has a three-phase project development process:

  • Phase I (or the project study) consists of developing the project scope, environmental studies, public involvement, and preliminary design of the project.
  • Phase II (design) consists of refining the design to develop contract plans and conduct land acquisition.
  • Phase III (construction) consists of the actual construction of the project.

Funding for a portion of this improvement is included in IDOT’s Proposed Highway Improvement Program Fiscal Year (FY) 2025-2030.

I-173 Boone County Project Schedule

Phase I 

  • 2019-2025
  • Preliminary engineering & enviornmental study
  • The project is currently in Phase I

Phase II 

  • 2025-2027
  • Contract plans, preparation & land acquisition

Phase III

  • 2027-2029
  • Construction

Note: This scedule is tentative and subject to change. 

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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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