An empty barge, top, pulls along side a barge filled with soybeans as they prepare to switch places at an Archer Daniels Midland grain river terminal along the Mississippi River Wednesday, Nov. 28, 2012, in Sauget, Ill. The potential closure of the river due to low water levels has raised concern for barge companies and others who use the river for shipping with a prolonged shutdown of the river possibly costing billions of dollars in losses. (AP Photo/Jeff Roberson)

Associated Press
An empty barge, top, pulls along side a barge filled with soybeans as they prepare to switch places at an Archer Daniels Midland grain river terminal along the Mississippi River Wednesday, Nov. 28, 2012, in Sauget, Ill. The potential closure of the river due to low water levels has raised concern for barge companies and others who use the river for shipping with a prolonged shutdown of the river possibly costing billions of dollars in losses. (AP Photo/Jeff Roberson)
An empty barge, top, pulls along side a barge filled with soybeans as they prepare to switch places at an Archer Daniels Midland grain river terminal along the Mississippi River Wednesday, Nov. 28, 2012, in Sauget, Ill. The potential closure of the river due to low water levels has raised concern for barge companies and others who use the river for shipping with a prolonged shutdown of the river possibly costing billions of dollars in losses. (AP Photo/Jeff Roberson)
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