Leo Frigo Bridge Accident: History of the Green Bay Structure and Its 2013 Structural Failure

Leo Frigo Bridge Accident Green Bay, Wisconsin — The Leo Frigo Memorial Bridge, one of Green Bay’s most important highway crossings, is widely known not for a single crash involving vehicles, but for a dramatic structural failure in 2013 that forced an emergency closure and drew national attention to bridge safety concerns.

The Leo Frigo Memorial Bridge carries Interstate 43 over the Fox River in Green Bay and serves as a key transportation route for tens of thousands of vehicles each day.

Built in 1981, the tied-arch bridge is one of the tallest in the region and remains a vital link for local and interstate traffic.

2013 “Sagging Bridge” Incident

On September 25, 2013, engineers discovered that a large section of the bridge had dropped unexpectedly after one of its support piers began to sink. The issue caused a noticeable sag in the roadway, prompting officials to immediately close the bridge in both directions as a precaution.

Investigators later determined that corrosion and soil conditions beneath one of the bridge’s foundations led to the failure of a pier footing, which caused part of the structure to settle. The incident forced months of emergency repairs and structural reinforcement before the bridge was safely reopened to traffic in January 2014.

Safety Reviews and Ongoing Monitoring

Following the 2013 incident, the bridge underwent extensive engineering review and was fitted with monitoring systems to detect movement or structural stress. Transportation officials confirmed that while the bridge experienced a rare foundation failure, it was successfully repaired and remains under routine inspection by the Wisconsin Department of Transportation.

More recently, federal transportation safety assessments have included the Leo Frigo Bridge among structures evaluated for potential vulnerability to external risks, such as vessel collision, though officials have repeatedly stated that the likelihood of such events remains low.

Legacy of the Structure

Despite its past structural scare, the Leo Frigo Bridge continues to serve as a major transportation artery for northeastern Wisconsin. The 2013 incident remains its most significant disruption, remembered by residents as a rare but serious engineering event rather than a vehicle-related crash.

Today, the bridge stands as both a critical infrastructure link and a case study in modern bridge monitoring and maintenance, with engineers continuing to emphasize long-term safety inspections and preventive monitoring.