UPDATE: State Police said all recovery work was done and all lanes were reopened at 8:40 p.m.

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MANCHAC, La. -- Southbound Interstate 55 at Manchac will be closed for at least eight hours as crews work to recover an 18-wheeler from the water below.

Traffic will be allowed to exit the interstate, travel on the low road and enter I-55 south at Ruddock, State Police Troop B said.