Semi Hits Lake Avenue Bridge, Shuts Edens Expressway Lanes in Wilmette

A semi-truck struck the Lake Avenue bridge over the Edens Expressway in Wilmette on Thursday, Sept. 17, forcing major lane closures on Interstate 94 during the late-afternoon commute and damaging multiple vehicles, according to Chicago-area reports.

NBC 5 Chicago reported the crash near Lake Avenue around 5:20 p.m., with all southbound lanes of the Edens closed and some northbound lanes also affected. CBS Chicago reported the semi-trailer was carrying steel beams, which spilled after the bridge strike. Reports also noted injuries, though the number and severity were not immediately clear from the available information.

What happened on the Edens

The incident occurred in Wilmette, a north suburb where the Edens Expressway carries heavy commuter and regional traffic between Chicago and northern Cook County. After the truck hit the bridge, debris and cargo created hazards for other drivers, and several cars were damaged.

Illinois State Police were involved in the response, and drivers were advised to seek alternate routes while lanes were blocked. The closures came at a high-impact time: the evening rush, when even a single-lane restriction on the Edens can quickly create backups through nearby interchanges and local roads.

Why it matters beyond Wilmette

Bridge strikes are not ordinary fender-benders. When a tall or loaded commercial vehicle hits a bridge, officials may need to deal with multiple problems at once: injured motorists, debris removal, damaged vehicles, spilled cargo, traffic control and a structural review of the bridge itself.

For Chicago-area drivers, the Edens is a key north-suburban artery. A shutdown near Lake Avenue can affect commuters heading between Chicago, Skokie, Evanston, Wilmette, Northfield and other northern suburbs. The impact can also ripple into connecting corridors, including I-294 and other regional routes used by drivers from northwest suburbs such as Schaumburg when traveling across the metro area.

What the available data shows

The confirmed public details point to a high-disruption crash: a semi-truck bridge strike, spilled or fallen cargo, damaged passenger vehicles, full closure of southbound lanes and partial northbound closures. The timing, around the evening commute, increased the practical effect on travel times.

The cargo detail is important because steel beams can create serious roadway hazards after a crash. Large metal loads can damage pavement, block lanes, strike vehicles or require specialized equipment to clear safely. That helps explain why officials could not treat the incident as a routine shoulder crash.

Key uncertainties and risks

Several important questions remained unresolved in the initial reports. The exact duration of the closure depended on debris removal, crash investigation and any bridge inspection required after impact. The final injury count and severity were also not fully established in the initial accounts.

The condition of the Lake Avenue bridge is another risk to watch. A bridge hit does not automatically mean a structure is unsafe, but transportation officials typically must determine whether girders, supports or protective elements were damaged before fully reopening affected lanes or removing restrictions.

For drivers, the lesson is practical: commercial-vehicle bridge strikes can shut down a major expressway with little warning. During incidents like this, the safest response is to follow official traffic advisories, avoid the immediate area if possible and allow extra time for alternate routes to absorb diverted traffic.

Sourcesnbcchicago.com  3990588nbcchicago.com  3952347cbsnews.com  semi trailer truck crash steel beams edens expressway lake…isp.illinois.gov  NewsReleases