Upstream approach wall contract reaches major milestone at Chickamauga Lock

A dive team member helps a diver conduct final equipment checks before an underwater inspection at the Chickamauga Lock Replacement Project site in Chattanooga, Tenn., June 16, 2026. Divers perform essential quality control by using feeler gauges to verify that each 420-ton concrete beam rests securely on its bearing pads. This meticulous process is crucial to the U.S. Army Corps of Engineers' mission of safely delivering modern and resilient infrastructure for the nation's inland waterways. (USACE Photo by Noe Gonzalez)