Iroquois County - IL 1 & CSX Railroad Milford

Illinois Department of Transportation

The primary purpose of the project is to improve safety and roadway operations by replacing the existing roadway/railroad grade separation for Illinois Route 1 roadway and CSX railroad just north of Milford. The project involves removing the existing single span thru girder bridge (SN 038-0024) and replacing it with a structure which carries IL 1 over the CSX Railroad just west of the existing viaduct. This bridge has been determined to be eligible for listing on the National Register of Historical Places.

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.

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Realigning IL 1 with a bridge over the CSX Railroad just north of Milford

Project Scope:

Realigning IL 1 with a new 44’ wide roadway bridge over the CSX Railroad approximately 200’ northwest of the existing bridge. Work includes:
- Relocating the County Highway 25 (CH 25) intersection to the north.
- Removing, consolidating, or relocating entrances.
- Constructing ditches and other highway drainage improvements.
Maintaining traffic under the existing bridge until the new bridge is built.
Removing the existing bridge over IL 1 and filling the underpass.

Project Purpose:

To address the condition of the bridge.
To address IL 1 clearances and flooding issues.

Project Need:

Deteriorated condition of the bridge carrying the CSX Railroad over IL 1.
Sag vertical clearance under the bridge (13’-8”) does not meet the minimum vertical clearance (14’) for bridges to remain in place.
Oversize vehicles hitting the bottom of the bridge
Occasional road closures due to flooding under the bridge.
Narrow roadway under the bridge.