Lt. Gen. Todd T. Semonite, U.S. Army Corps of Engineers commander and chief of engineers, walks up a makeshift stairwell after seeing the through-sill water intakes, which are giant 150-foot wide by 25-foot high tunnelways that will make it possible to fill the lock with 60 million gallons of water in 17 minutes, while touring the Kentucky Lock Addition Project in Grand Rivers, Ky., June 7, 2016. The Nashville District is building the new 1,200-foot by 110-foot lock next to the existing 600-foot by 110-foot lock.