The U.S. Army Corps of Engineers Nashville District and its contractor partner Johnson Brothers put a 1.7 million pound concrete shell into position Feb. 2, 2020 on the riverbed on downstream end of Kentucky Lock where it will be part of a coffer dam and eventually a permanent part of the new lock wall for the Kentucky Lock Addition Project. It is the last of 10 shells. The lock is located at Kentucky Dam, which is a Tennessee Valley Authority project at Tennessee River mile 22.4. (USACE Photo by Mark Rankin)