As many as 11 barges broke loose from their tow Friday afternoon and slammed into upstream side of Lock & Dam 11 on the Mississippi River at Dubuque.
The barges hit the dam at mid-afternoon. Several people said they heard what sounded like a 'boom' as the loaded barges ended up against the dam.
It's unclear exactly what happened to cause the barges to break free from their tow.
Upper Mississippi River towboats, like those what navigate through Lock and Dam 11 at Dubuque, can handle up to 15 or 16 barges.
It's unclear if the towboat involved in Friday's accident was pushing just the 11.
It could take several days to remove the 11 barges from their resting points against the dam.
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