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This Nov. 28, 2012 photo provided by The United States Coast Guard shows man-made dikes along the shoreline of the Mississippi River South of St. Louis. The dikes, perpendicular to the shore, help direct the water flow back into the river to maintain a navigable depth. They are normally not seen but now exposed along with their large sandbars by months of drought and low water levels the could close the river to barge traffic. (AP Photo/United States Coast Guard, Colby Buchanan)

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