The front of the barge flotilla pushes into the lock. If you have a big enough monitor you may see two crew members on the front corners, Strikes me as a dangerous job. I may have missed something about how the process works. The upper river flotillas are 3 by 6 barges. (They are at least twice as big on the lower Mississippi without locks.) The whole set pushes part way in. Then the crew breaks apart the front two rows from the back. The push boat pulls the rear barges back out of the lock. What happens next comes tomorrow.
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