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Photo by: Patrick Semansky

Inmates fill sand bags for residents in Butte LaRose, La., on Tuesday, May 10, 2011, in advance of possible flooding brought on by the planned opening of the Morganza Spillway. The U.S. Army Corps of Engineers received permission to open the Old River Control Structure north of Baton Rouge, which will divert water from the Mississippi River into the spillway in order to alleviate pressure on river levees. (AP Photo/Patrick Semansky)

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