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Illinois Route 47 (IL 47) at Interstate 88 (I-88)

The Village of Sugar Grove in partnership with the Illinois Department of Transportation (Department), Kane County, and the Illinois Tollway completed a preliminary engineering and environmental study (Phase I) for the improvement of Illinois Route 47 (IL 47) from Old Oaks Road/Waubonsee Drive to Green Road in December of 2018.

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.


Illinois Route 47 (IL 47), from Old Oaks Road/Waubonsee Drive to Green Road, is located in the Village of Sugar Grove in Kane County.  IL 47 will be widened from a 2-lane facility to a 4-lane facility.  A raised 30-foot median with mountable curb will be provided.  The centerline alignment of reconstructed IL 47 will generally be 30 feet east of the existing centerline alignment.  A rural cross section with ditches and culverts will be developed on the outside of IL 47 in both directions.  Provisions for a future shared-use path will be made on the east side of IL 47 as well as provisions for a future sidewalk on the west side of IL 47.

A partial cloverleaf interchange with a loop ramp in the northeast quadrant has been built by the Illinois Tollway at the intersection of Interstate 88 (I-88) and IL 47 and now provides full access to I-88.

The Illinois Department of Transportation (Department) develops and implements projects using the following three-phase process:

  • Phase I: Preliminary Engineering and Environmental Studies (Completed in December of 2018)
  • Phase II: Contract Plan Preparation and Land Acquisition (Typically 18-24 months)
  • Phase III: Construction and Construction Engineering (Typically 12-24 months)

Contract plan preparation, land acquisition, construction and construction engineering for the mainline improvement is not currently included in the Department’s FY 2020-2025 Proposed Highway Improvement Program.  However, this project will be included in the Department’s priorities for future funding consideration among similar improvement needs throughout the region.

The interchange was constructed by the Illinois Tollway and opened at the end of 2019.

An Environmental Assessment was completed for the project in November of 2017 and a Finding of No Significant Impacts (FONSI) was received from the Federal Highway Administration in June of 2018.

Contact Person:

Corey J. Smith, P.E., Project Manager
(847) 705-4103

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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