The last part of how a barge flotilla gets through Lock and Dam 26 on the Mississippi. The group has been broken into two sets of two barges long. The lock has been closed behind the front set. In a moment, the front gates will open, bringing the water level down to that of the next section of the river. One of the tan tug boats on the left will come around and pull this group out. Then the second half will repeat the procedure.
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