Report Finds More Than 47,000 'Structurally Deficient' Bridges In The U.S.

The collapse of a bridge earlier this week in Tennessee is raising new alarms about the delicate state of infrastructure across the U.S.

Tennessee Department of Transportation engineers say that a concrete overpass spanning an interstate highway in Chattanooga fell when a truck carrying an oversize load hit the bottom of the bridge and sliced through steel beams underneath. One person driving underneath the bridge was injured, police say.

See more