Dwayne Ponds (Right), U.S. Army Corps of Engineers Nashville District project geologist, explains the ongoing work to place concrete and construct a new navigation lock to R.D. James, assistant secretary of the Army for Civil Works, during a walking tour Nov. 14, 2019 at Chickamauga Lock on the Tennessee River in Chattanooga, Tenn. The Nashville District is constructing a new 110-foot by 600-foot navigation lock at the Tennessee Valley Authority project.