A concrete 'barrier,' also called a bridge rail on the southbound lanes of Interstate 75, collapsed Monday morning onto Interstate 24 westbound around 11:30am.

A car driving on I-24 ran into the rail, injuring the driver, who was taken to a local hospital with what has been described as 'non-life-threatening injuries.'

The Tennessee Department of Transportations last inspection of the structure was July 30, 2018. The bridge was built in 1959, and carries two lanes of southbound Interstate 75 traffic over two lanes of Interstate 24 westbound.

The bridge was given a sufficiency rating of 74.7 and rated "structurally fair." According to the Tennessee Highway Bridge Report online, the year prior it was given an 84.9. A sufficiency rating is a numerical grading system that determines if a bridge should remain in service.

During that inspection, it was determined that the bridge needed to be widened, but no deck repairs were necessary. A contract for the expansion of the interchange was awarded in late 2018, but no construction work has begun.

The bridge was built in 1959 and carries two lanes of southbound Interstate 75 traffic over two lanes of Interstate 24 westbound toward downtown Chattanooga and beyond to Nashville.

The bridge itself is 148 feet long according to TDOT's records and is considered to be part of the National Network, a national truck route designated by the U.S. Department of Transportation.

Here is the full inspection report from TDOT:

Crews are working to open the westbound lane of Interstate 24 opened Monday evening.

Emergency repairs are underway, but the southbound lanes of Interstate 75 are closed. Crews hope to open one lane southbound to Atlanta but the time for that has yet to be determined.

The actual cause of the collapse has yet to be determined. Video from TDOT camera will be examined to see if there was a vehicle that may have been the cause.

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