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Home This is Lock 4 on the Cumberland River in Tennessee July 1, 1914. The U.S. Army Corps of Engineers Nashville District built the lock and dam to establish a navigation channel. The old locks and dams were replaced by today’s modern dams. (USACE Photo) This is Lock 4 on the Cumberland River in Tennessee July 1, 1914. The U.S. Army Corps of Engineers Nashville District built the lock and dam to establish a navigation channel. The old locks and dams were replaced by today's modern dams. (USACE Photo)

This is Lock 4 on the Cumberland River in Tennessee July 1, 1914. The U.S. Army Corps of Engineers Nashville District built the lock and dam to establish a navigation channel. The old locks and dams were replaced by today’s modern dams. (USACE Photo)

This is Lock 4 on the Cumberland River in Tennessee July 1, 1914. The U.S. Army Corps of Engineers Nashville District built the lock and dam to establish a navigation channel. The old locks and dams were replaced by today's modern dams. (USACE Photo)

This is Lock 4 on the Cumberland River in Tennessee July 1, 1914. The U.S. Army Corps of Engineers Nashville District built the lock and dam to establish a navigation channel. The old locks and dams were replaced by today’s modern dams. (USACE Photo)

Lock 1 on the Cumberland River in Nashville, Tenn., is shown under construction Nov. 18, 1893. The U.S. Army Corps of Engineers Nashville District constructed the lock and dam to establish a navigation channel. This lock and dam was replaced by today’s modern dam system. (USACE Photo)