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“It’s where the upbound and downbound shipping kind of crossed each other,” Gray said.

The lock and dam is closed, and the Coast Guard said it left a queue of 13 vessels that are upbound and 11 downbound.

Two upbound vessels towing a total of 30 barges were delayed at a railroad drawbridge in Hannibal, Missouri, a Coast Guard spokesman said.

A third channel, west of all the islands, was designed for steamers bound down, the older channel being reserved for upbound boats.

I nods and makes a dive into an upbound car that's just makin' a stop at the seventeenth.