Maj. Gen. Mark Toy, U.S. Army Corps of Engineers Great Lakes and Ohio River Division commander, observes operations to construct concrete shells being assembled on the shoreline of the Tennessee River during a ride in a Corps of Engineers patrol boat at the Kentucky Lock Addition Project in Grand Rivers June 4, 2019. The shells are being installed to the downstream riverbed for dual use as part of the permanent lock wall and for the coffer dam. (USACE photo by Lee Roberts)