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Illinois 4/15 Kaskaskia River Bridge Study
St. Clair County

Welcome to the website for the Illinois 4/15 Kaskaskia River Bridge Study project in St. Clair County. The Illinois Department of Transportation created this site to provide information about the progress of the project and to facilitate public input and participation. If you would like to submit your comments or questions or sign up for the project mailing list, please visit the (Get Involved) section of this website. Thank you for your interest in the Illinois 4/15 Kaskaskia River Bridge Study project.


The Illinois Department of Transportation is performing a Preliminary Engineering and Environmental Study to analyze the replacement of the bridge carrying Illinois 4/15 over the Kaskaskia River (SN 082-0077) near Fayetteville in St. Clair County. 

The bridge was constructed in 1946 and rehabilitated in 2013. The Annual Average Daily Traffic is 4,400.  The Illinois Department of Transportation has determined this structure needs to be replaced due to the rising and continual cost of maintenance since the bridge is nearing the end of its design life.


This bridge provides one of the few links across the Kaskaskia River in the region, serving the trucking and agricultural industries, in addition to commuters of neighboring towns to their destinations.  Without this vital link across the Kaskaskia River, the shortest alternative route would add approximately 30 miles to a trip.

Illinois 4 and 15 are two separate arterial roads that merge through Fayetteville before dividing again outside the village limits.  This corridor is important for motorists in the area as it provides a means for travelers to get to north and south destinations such as Scott Air Force Base, MidAmerica Airport, the World Shooting Complex in Sparta, interstates 64 and 55, southern Illinois communities and to the St. Louis metro region to the west.

The Kaskaskia River is a navigable waterway from the Mississippi River to just south of Fayetteville, providing a route for the transportation of coal and grain by barge.  Only recreational watercraft are allowed north of Fayetteville through the section of the river in the study area.

The project is located adjacent to Fayetteville in southeastern St. Clair County.  The village of Fayetteville sits just west of the Kaskaskia River with an approximate population of 400.  The aerial map below illustrates the proximity of the village to the Kaskaskia River. 


Phase I: Current Phase of the Project

The Illinois 4/15 Kaskaskia River Bridge Study is currently in Phase I, and there is an approximate 36-month schedule for the Phase I work.  Proposed highway improvements are typically processed in three phases.  In Phase I (preliminary engineering phase), proposed geometry, environmental concerns, and right-of-way requirements are defined.  During Phase II, contract plans are prepared, and the necessary right-of-way is acquired.  Phase III represents the actual construction of the improvement. 


IDOT and its engineering consultant team will inventory existing conditions, such as traffic data and crash history, and will identify and document environmental constraints as the project moves forward. The Project Study Group, with input from the public, will also develop and refine improvement alternatives. The result of the study will be a design for a new bridge that addresses identified transportation issues and serves the area’s future needs.  Public involvement will take place throughout the project development.


A full crash analysis will be completed for the project. Measures to reduce crashes will be evaluated and included in the overall project design.

The project is using a public involvement program referred to as Context Sensitive Solutions. 

Context Sensitive Solutions

An important part of the bridge study project is public participation.  The Illinois Department of Transportation utilizes CSS as a way to continually engage stakeholders in the study.  As identified in the Illinois Department of Transportation’s CSS policies, stakeholder involvement is critical to a study’s success. The CSS process strives to achieve the following:

  • Understand stakeholders’ key issues and concerns
  • Involve stakeholders in the decision-making process early and often
  • Establish an understanding of the stakeholders’ role in the study
  • Consider all modes of transportation
  • Set a project schedule
  • Apply flexibility in design to address stakeholders’ concerns whenever possible

Stakeholder Involvement Plan

The goal of the SIP is to outline a program of activities to actively engage stakeholders throughout the Phase I process. The objectives of the SIP are to:

  • Identify stakeholders
  • Identify the roles and responsibilities of the lead agency
  • Establish the timing and type of outreach activities with all stakeholders
  • Establish stakeholder requirements for providing timely input to the study development process
  • Provide an approach for evaluating the effectiveness of the public-participation program and refine, as appropriate, to respond to public needs and concerns

Please click here to view the Stakeholder Involvement Plan. 

Project Study Group

The PSG consists of representatives from the Illinois Department of Transportation, Federal Highway Administration, and the study consultant engineering team. The PSG is tasked with performing detailed analyses of subjects that require various environmental, engineering, and project development expertise. As a result, the PSG will determine study recommendations and decisions for this study.

Community Advisory Group

One highlight of the public involvement program is the Community Advisory Group. The purpose of the CAG is to provide input from the public’s perspective on various elements of the study, including developing a problem statement, identifying issues important to the public, and providing feedback on alternatives. The Illinois Department of Transportation will consider this input as it makes decisions during the project development, along with the results of engineering and environmental studies.

The CAG will consist of a representative cross-section of stakeholders who represent local interests, such as elected leaders, cities/villages, economic development, environment, industry, residents, businesses, tourism, commuters, and others with a stake in the study’s outcome. The CAG members will be initially identified by the PSG as a result of a review of the project area property owners, stakeholder conversations, public outreach, and comments received.

The project team is in the process of selecting CAG members.  Please click here to fill out a CAG application form to submit your name for consideration if you are interested in serving as a representative on the CAG.

Public Informational Meetings

Public involvement for the Illinois 4/15 Kaskaskia River Bridge Study will include multiple opportunities for the public to participate in the study through public informational meetings. These meetings will foster public awareness of study developments and alternatives that are being evaluated. These meetings also will provide a forum for stakeholder input, including concerns and comments regarding study alternatives. Comment forms will be available at all public meetings and online on the project website. Public informational meetings may be held in-person, virtually, or a combination of both formats.

06/15/22 Public Meeting #1 – IDOT held the IL 4/15 Kaskaskia River Bridge Study in-person Public Meeting on Wednesday June 15, 2022, from 4 – 7 p.m. at the St. Pancratius Church Hall in Fayetteville, IL.  This Public Meeting was an open forum meeting.  The Project Study Team was available at this meeting to answer questions, take comments, and provide information about the project.

For those who were unable to attend this meeting in person, public meeting exhibits and habdouts can be viewed below. Approximately 132 people attended this Public Meeting, and 38 comments were received.  Most of the comments requested that the bridge that carries Illinois 4/15 over the Kaskaskia River not be closed during construction.

  • Public Meeting #1 Exhibits - Please click here to view the IL 4/15 over Kaskaskia River Public Meeting #1 Exhibits
  • Public Meeting #1 Brochure - Please click here to view the IL 4/15 over Kaskaskia River Public Meeting #1 Brochure


The project includes multiple opportunities for you to participate

  • Website: Visit this project website regularly for updates
  • Mailing List: To receive the project newsletter and public meeting announcements please contact Matthew Meyer at (618) 346-3160 or by e-mail at matthew.meyer@illinois.gov
  • Community Advisory Group: Submit your name for consideration of inclusion on the CAG by clicking here
  • Public Meeting: IDOT held a Public Meeting for this project on June 15 from 4 - 7 p.m. at the St. Pancratius Church Hall, 2213 N. Second St., Fayetteville.


The Illinois Department of Transportation values your comments and questions. We provide responses to all questions and strive to do so in a timely manner.

All contact information is for the sole use of the Illinois 4/15 Kaskaskia River Bridge Study project.  When submitting a question or comment, your name will be added, if you choose, to the project mailing list so that you can be notified of any upcoming public involvement activities.

If you have questions or comments about this project, please contact Matthew Meyer at (618) 346-3160 or by e-mail at matthew.meyer@illinois.gov.  Or, you can mail:

Illinois Department of Transportation
Attn: Mr. Matthew Meyer
1102 Eastport Plaza Drive
Collinsville, IL 62234

What is the purpose of this study?
The purpose of this study is to evaluate the need to replace the bridge that carries Illinois 4/15 over the Kaskaskia River. If it is determined to be necessary to replace the bridge, the goal of the project would be to develop a proposed design for the new bridge.

Why is the Illinois Department of Transportation studying this bridge?
The Illinois Department of Transportation is studying this bridge due to the deteriorating condition and age of the bridge.

Will additional right-of-way be required with this project?
It is a possibility that ROW may be required with this project; however, this has not been determined.  The Illinois Department of Transportation is in the initial stage of this preliminary engineering study.  Once the scope of work is determined and a design is developed, the amount of ROW, if any, will be determined.

How will construction of this project be completed?
This has not yet been determined.  Once a scope of work has been determined, in conjunction with input from the public, a preliminary design will be developed.  As part of that, an analysis will be done to evaluate various construction methods to minimize travel disruptions to the motoring public.

What is the current stage of project development?
Proposed highway improvements are typically processed in three distinct phases. In Phase I

 (preliminary engineering phase), public involvement, proposed geometry, environmental concerns, and right of way requirements are defined. This phase is estimated to be 36 months. During Phase II, contract plans are prepared, and the necessary right of way is acquired. This phase generally takes an estimated 18-24 months. Phase III represents the actual construction of the improvement. This project is currently in Phase I.

Will the project impact the bike trail?
The Illinois Department of Transportation will take all precautions to protect the bike trail from impacts during construction and will take measures to keep the bike trail open during construction

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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