Jane Addams Memorial Tollway (I-90)

Interchange Route 23 Interchange Project

Project Overview

The $33.4 million Illinois Route 23 Interchange Project on the Jane Addams Memorial Tollway (I-90) in Marengo will create a new, full-access interchange with local road improvements, including construction of  roundabouts. Work is scheduled to begin in March 2019 and be complete this fall.

Read More


Illinois Route 23 Interchange Project Map

Illinois Route 23 Interchange Project Map
> View full-size map

Illinois Route 23 Interchange Design Video

Construction Update (9/19/19)

At Illinois Route 23, the outside shoulders in both directions on I-90 are closed. 

Traffic is also shifted and reduced to a single lane in both directions on Illinois Route 23.

Traffic is scheduled to remain in this configuration through fall.


Customer Impact

Traffic shift and lane reductions will be necessary to provide a work zone and safely accommodate traffic. 

On Illinois Route 23, one lane in both directions will remain open for the duration of the project, however traffic may be reduced to one lane during off-peak hours for construction. At those times, traffic will be maintained in both directions with flaggers. 

On Harmony Road, a closure and detour between Illinois Route 23 and Maple Street will also be needed to complete work on the project.


The Illinois Route 23 Interchange Project will create opportunity for continued economic development along Illinois Route 23 and will open up access between the Tollway and the northwest suburbs. This will be the first direct interstate connection to I-90 constructed in McHenry County. 

Building Green

The Tollway is committed to "Building Green" and minimizing the environmental impact of construction by reducing, recycling and reusing materials. In addition to reducing the cost of this work, reuse of these materials reduces the need for virgin asphalt materials and reduces energy consumption, greenhouse gases and the volume of material that would otherwise be sent to landfills.

Work Zone Safety

The Illinois Tollway is committed to ensuring that the Jane Addams Memorial Tollway (I-90), Illinois Route 23 and local roads remain safe for both drivers and workers during construction, which is part of the agency’s overall commitment to roadway safety.  

A 45 mph work zone speed limit will be in effect on I-90 throughout the reconstruction project.  A 25 mph work zone speed limit will be in effect on Illinois Route 23.

Visit the Tollway's Work Zone Safety page.