FILE - In this Monday, Jan. 7, 2013 file photo, Durocher Marine boats sit in the water as they work to deepen the waterways on the Mississippi River just outside of Thebes, Ill. Crews h

 

              FILE - In this Monday, Jan. 7, 2013 file photo, Durocher Marine boats sit in the water as they work to deepen the waterways on the Mississippi River just outside of Thebes, Ill. Crews h
FILE - In this Monday, Jan. 7, 2013 file photo, Durocher Marine boats sit in the water as they work to deepen the waterways on the Mississippi River just outside of Thebes, Ill. Crews have completed the most critical phase of removing bedrock that threatened barges along a crucial stretch of the drought-starved Mississippi River, staving off the shipping industry's fears that the treacherous channel could close to traffic, the U.S. Army Corps of Engineers said Saturday, Jan. 12, 2013. (AP Photo/The Southern Illinoisan, Paul Newton, File)