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BALTIMORE COUNTY, Maryland ( KTVT ) -- Investigators are working to determine the cause of the collapse of a 145-year-old bridge in Baltimore County on Monday, while the brother of a septic truck driver is relieved there were no injuries.

The historic, one-lane bridge on Carroll Road in Phoenix, Maryland, is used by thousands of vehicles daily, and the structure fell apart as the septic truck drove over it.

"I'm so glad he is alive," the brother of the septic truck driver told WJZ Investigates.

Sudden bridge collapse

The first calls came in just after 5 p.m. Monday about a bridge failure less than a 10-minute drive from Hunt Valley Town Center.

"Alert rescue boats. Philpot Road and Carroll Road for a bridge collapse with a vehicle on top," the d

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