CNN is reporting a lock break has occurred on the Ohio River near Warsaw, Kentucky, according to the Army Corps of Engineers.
That is where the Markland Dam is located.
Corps spokesman Todd Hornback called the break, which occurred Sunday morning, "catastrophic."
The incident involved structures, and there were no reports of injuries to people.
All traffic on the river has been stopped in both directions since about 9 a.m. ET, Hornback said.
It was not known what caused the break.
One of the broken portions is known as a miter gate, Hornback said.
The Corps of Engineers, on its Web site, says a miter gate "has two leaves that provide a closure at one end of the lock."
They are so named because the two leaves meet at an angle pointing upstream and resembling a miter joint, the Web site said.
