Jane Addams Memorial Tollway (I-90)

Illinois Route 23 Interchange Project

Project Overview

The Illinois Route 23 Interchange Project on the Jane Addams Memorial Tollway (I-90) in Marengo is delivering a new, full-access interchange with local road improvements, including construction of roundabouts.

The $33.4 million interchange project is made possible through a partnership with the City of Marengo, McHenry County and the Illinois Department of Transportation.

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Illinois Route 23 Interchange Project Map

Illinois Route 23 Interchange Project Map
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Illinois Route 23 Interchange Design Video

Construction Update (7/6/20)

This project was completed on July 3. All traffic is now in its permanent configuration. 

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 opens up access between the Tollway and the northwest suburbs. This will be the first direct interstate connection to I-90 constructed in McHenry County. 

All-Electronic Interchange

The Illinois Route 23 Interchange is an all-electronic interchange with cashless toll plazas for vehicles with I-PASS located on the ramp carrying traffic from the east and on the ramps carrying traffic to and from the west.

Cars with I-PASS pay 75 cents. Trucks tolls range from $2.50 to $6.65 during daytime hours, with overnight discounts offered. Those without I-PASS can pay their tolls online at the cash rate within the seven-day grace period. Grace period toll payments are double the I-PASS rates.

Work Zone Safety

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

Work zone speed limits are in effect in all construction zones 24/7 and drivers should continue to watch for changing traffic patterns and use caution, especially when workers are present. Visit the Tollway's Work Zone Safety page.