Study Overview
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Illinois Department of Transportation
Jay M. Wavering, P.E., Project Engineer
(217) 785-9046

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Jeffrey P. Myers, P.E.
Illinois Department of Transportation
Region Four Engineer
126 East Ash St.
Springfield, IL 62704
Attn.: Jay M. Wavering, P.E.

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Study Overview


The Illinois 100/106, Florence Bridge, River Crossing Project Study was preceded by the Lower Illinois River Regional Crossing Study (LIRRCS), which was completed in 2013. LIRRCS examined the feasibility of several potential solutions to provide local and regional crossing mobility across the Illinois River in Scott, Pike, Greene and Calhoun counties. This study can consider previous alternatives or new alternatives, but is not bound by the results of the LIRRCS. It will further develop the detailed engineering and environmental analysis required by federal law, under the National Environmental Policy Act (NEPA). Community involvement will also play a major role in this process and is key to the successful completion of the Phase I (Planning) Study.

Who is on the Project Study Group?

The Project Study Group is led by IDOT in partnership with the Federal Highway Administration (FHWA). WSP | Parsons Brinckerhoff was selected as the engineering consultant firm to help IDOT with the development of the Phase I (Planning) Study. They will be assisted by four subconsultant firms: Crawford Murphy & Tilly, EFK Moen, Kaskaskia Engineering Group, and TSi Geotechnical and will prepare a Design Report and Environmental Assessment (EA).

What are the steps of the Illinois 100/106 River Crossing Project Study?

The Project Study Group will be tasked with creating the environmental document, which must follow federal guidelines stated in NEPA. This will enable the State to become eligible for federal funding to help pay for the final design and construction of the improvements planned by this study.

The NEPA process includes the following steps:

  • Establish a project Purpose and Need
  • Identify and evaluate a range of alternatives; disclosing the benefits as well as impacts of each alternative
    • A "No Build" alternative is also considered as a baseline for evaluation of the other alternatives
  • Identify a preferred alternative
  • Avoid, minimize, and mitigate environmental impacts
  • Consider public input in the decision-making process along each of these steps
IDOT will submit the final EA for approval by FHWA to address all environmental impacts of the project, and will prepare a final Design Report that will be the basis of the Phase II (Design).