Tub Boat Chariot K. Smith pushes barge into Chickamauga Lock
The Tug Boat Chariot K. Smith pushes a barge into Chickamauga Lock in Chattanooga, Tenn., March 23, 2012. From 1997 to 2010, annual tonnage passing through the lock ranged from .7 to 2.7 million tons. The annual transportation rate of savings for one million tons of cargo going through this lock is estimated at $18 million.

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Photo by: Lee Roberts |  VIRIN: 120223-A-EO110-012.JPG