In this Dec. 12, 2012 photo provided by the United States Coast Guard, barges crowd one of the busiest fleeting areas, where barges are stored, loaded and unloaded, on the Mississippi River South of St. Louis. Barge operators along a key stretch of the Mississippi River braced Monday, Dec. 17, for months of restricted shipping as crews prepared to begin blasting large rock formations that are impeding navigation on the drought-plagued waterway. (AP Photo/U.S. Coast Guard, Colby Buchanan)

Associated Press
In this Dec. 12, 2012 photo provided by the United States Coast Guard, barges crowd one of the busiest fleeting areas, where barges are stored, loaded and unloaded, on the Mississippi River South of St. Louis. Barge operators along a key stretch of the Mississippi River braced Monday, Dec. 17, for months of restricted shipping as crews prepared to begin blasting large rock formations that are impeding navigation on the drought-plagued waterway. (AP Photo/U.S. Coast Guard, Colby Buchanan)
In this Dec. 12, 2012 photo provided by the United States Coast Guard, barges crowd one of the busiest fleeting areas, where barges are stored, loaded and unloaded, on the Mississippi River South of St. Louis. Barge operators along a key stretch of the Mississippi River braced Monday, Dec. 17, for months of restricted shipping as crews prepared to begin blasting large rock formations that are impeding navigation on the drought-plagued waterway. (AP Photo/U.S. Coast Guard, Colby Buchanan)
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