A Coast Guard boat patrols in the foreground as a barge makes its way down the Mississippi River Friday, Nov. 16, 2012, in St. Louis. A top Corps of Engineers official has ordered the release of water from an upper Mississippi River reservoir in an effort to avoid closure of the river at St. Louis to barge traffic due to low water levels caused by drought. (AP Photo/Jeff Roberson)

Associated Press
A Coast Guard boat patrols in the foreground as a barge makes its way down the Mississippi River Friday, Nov. 16, 2012, in St. Louis. A top Corps of Engineers official has ordered the release of water from an upper Mississippi River reservoir in an effort to avoid closure of the river at St. Louis to barge traffic due to low water levels caused by drought. (AP Photo/Jeff Roberson)
A Coast Guard boat patrols in the foreground as a barge makes its way down the Mississippi River Friday, Nov. 16, 2012, in St. Louis. A top Corps of Engineers official has ordered the release of water from an upper Mississippi River reservoir in an effort to avoid closure of the river at St. Louis to barge traffic due to low water levels caused by drought. (AP Photo/Jeff Roberson)
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