Construction workers from contractor Thalle Construction complete the first monolith “top-out” on the Kentucky Lock Addition Project located in Grand Rivers, KY, Oct. 12, 2024. A monolith is a single structure of concrete that is in the shape of a column. There are a total of 50 monoliths that are to be constructed made from five-foot layers of concrete. Each five-foot layer is called a lift. Early Saturday morning, the final concrete lift was completed for a monolith located on the downstream side of the lock being constructed. (USACE Photo by Bodie Richardson)