Boats from Newt Marine in Dubuque, Iowa, work to remove rock pinnacles from the the waterway in order to deepen it on Monday, Jan. 7, 2013, on the Mississippi River just outside of Theb

 

              Boats from Newt Marine in Dubuque, Iowa, work to remove rock pinnacles from the the waterway in order to deepen it on Monday, Jan. 7, 2013, on the Mississippi River just outside of Theb
Boats from Newt Marine in Dubuque, Iowa, work to remove rock pinnacles from the the waterway in order to deepen it 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)