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Illinois Department of Transportation

Resources

Documents

Project Location Map

The study limits include Illinois 173 beginning 0.4 miles west of the Village of Poplar Grove and extending east to Boone-McHenry County Line Road, over 8 miles.

Project Location Map

Phase I Pre-Final Geometry Plans

The phase I pre-final geometry plans are based on the analyses for the recommended design improvements. These plans represent the recommended design improvements at approximately 90% complete. These plans are being used for the following tasks.

  • Public involvement
  • Set preliminary construction limits
  • Set preliminary right-of-way limits and determine any easement requirements
  • Obtain approval of all design exceptions (A design exception is a deviation from prevailing design standards to achieve a balance of project needs and community values)
  • Conduct preliminary utility review to determine if any utility adjustments are necessary
  • Prepare the drainage report
  • Prepare the environmental documentation

Adjustment to the phase I pre-final geometry plans may be made to accommodate the results of the above analysis, public involvement, and other tasks.

Note that phase I (the project study) pre-final geometry plans are for planning and not construction. During phase II (design) additional details are added to the phase I pre-final geometry plans to create the phase II construction plans.

Plan and Profile Sheets

The plan and profile sheets are a type of engineering drawing that combines a plan view and a profile view of the road. The plan view is a map of the road. The profile view is a plot of the elevations of roadway features, such as centerline and ditches, where the horizontal axis (x axis) is based on feet along the centerline of the road and the vertical axis (y-axis) is the elevation.

Typical Section Sheets

Typical sections are detailed cross section depictions of the highway's principal elements that are standard between specified station limits, feet along the road. These sections are the basis for construction details and information shown on the various plan sheets throughout the improvement. Typical sections show typical conditions only. Non-standard conditions that prevail for short distances are not shown.

UPDATES

Virtual Public Information Meeting

The Virtual Public Information Meeting is tentatively scheduled for Mid-January 2024.

QUESTIONS & COMMENTS

Question and Comment

Check the Frequently Ask Questions (FAQ) page.

Or see the Join the Mailing List, Submit Comments And Questions to receive the project newsletter, public meeting announcements, and submit comments and questions.