A 37-mile stretch of the Reagan Memorial Tollway carrying tens of thousands of commuters and freight trucks through Chicago's western suburbs each day is about to get a significant infrastructure upgrade, as the Illinois State Toll Highway Authority moves to rehabilitate aging bridges across DeKalb, Kane, and DuPage counties.

The project covers I-88 from Illinois Route 251, near the Rochelle and Dixon area, east to Illinois Route 59 near Naperville. Many of the bridges along this corridor were built in the 1950s and 1960s, when the road was originally constructed as the East-West Tollway. That puts them at 60 to 70 years old, well past the 50-year design life engineers originally intended.

The Tollway is now seeking a contractor for the work, with a formal bid opening scheduled for late March. While the agency has not publicly disclosed a total project cost, the scope of rehabilitating bridge structures across 37 miles of interstate suggests a price tag likely exceeding $100 million, consistent with similar large-scale Tollway projects in recent years.

The rehabilitation fits within the Tollway's broader capital program, Move Illinois, a multibillion-dollar initiative launched in 2012 to modernize the 294-mile tollway system. That program has been extended and expanded multiple times, with the Tollway board approving successive rounds of spending to address infrastructure that was largely built during the postwar highway boom.

Unlike most highway agencies, the Illinois Tollway funds its projects through toll revenue and bond proceeds rather than state or federal gas taxes. That fiscal independence means the cost of this rehabilitation falls directly on the drivers who use I-88, a corridor that has seen steadily rising traffic as western suburban communities in DuPage and Kane counties have grown. Kane County has been one of Illinois' fastest-growing counties over the past two decades, and the route also serves Northern Illinois University in DeKalb.

The urgency extends beyond one corridor. Illinois consistently ranks among the worst states in the country for bridge condition, according to assessments by the American Road and Transportation Builders Association and the American Society of Civil Engineers. Nationally, the 2021 Bipartisan Infrastructure Law directed $27.5 billion toward bridge repair, the largest such investment since the Interstate Highway System was built, though the Tollway's self-funded model means it largely operates outside that federal pipeline.

Drivers along I-88 should expect construction-related disruptions once work begins, though the Tollway has not yet released a detailed timeline. The corridor already competes with I-290 as a commuter route into Chicago, and lane closures or detours could ripple across the region's traffic patterns. Details on phasing and traffic management are expected to follow contractor selection.