Workers with Durocher Marine pull a rock out of the river while working to deepen the waterways on Monday, Jan. 7, 2013, on the Mississippi River just outside of Thebes, Ill. The rock-c

 

              Workers with Durocher Marine pull a rock out of the river while working to deepen the waterways on Monday, Jan. 7, 2013, on the Mississippi River just outside of Thebes, Ill. The rock-c
Workers with Durocher Marine pull a rock out of the river while working to deepen the waterways on Monday, Jan. 7, 2013, on the Mississippi River just outside of Thebes, Ill. The rock-clearing effort is considered vital in ensuring that stretch of river remains open to barge traffic. (AP Photo/The Southern Illinoisan, Paul Newton)