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Home A Derrick arrangement is in the pit during the construction of Lock 4 Oct. 26, 1894 on the Cumberland River in Tennessee. The lock and dam were constructed to establish a navigation channel. The lock and dam were replaced by today’s modern system of dams. (USACE Photo) A Derrick arrangement is in the pit during the construction of Lock 4 Oct. 26, 1894 on the Cumberland River in Tennessee. The lock and dam were constructed to establish a navigation channel. The lock and dam were replaced by today's modern system of dams. (USACE Photo)

A Derrick arrangement is in the pit during the construction of Lock 4 Oct. 26, 1894 on the Cumberland River in Tennessee. The lock and dam were constructed to establish a navigation channel. The lock and dam were replaced by today’s modern system of dams. (USACE Photo)

A Derrick arrangement is in the pit during the construction of Lock 4 Oct. 26, 1894 on the Cumberland River in Tennessee. The lock and dam were constructed to establish a navigation channel. The lock and dam were replaced by today's modern system of dams. (USACE Photo)

A Derrick arrangement is in the pit during the construction of Lock 4 Oct. 26, 1894 on the Cumberland River in Tennessee. The lock and dam were constructed to establish a navigation channel. The lock and dam were replaced by today’s modern system of 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)