241206-A-GA333-1668
Shimmick Construction Company workers transfer a miter gate component at Chickamauga Lock near Chattanooga, Tennessee, Dec. 6, 2024. A total of 14 miter gate components are being delivered to the site each day from Dec.5-23, 2024. The Chickamauga Lock replacement project, managed by the U.S. Army Corps of Engineers Nashville District, includes designing a new 110-foot by 600-foot navigation lock to replace the current lock, which is necessary due to alkali-aggregate reaction, a chemical process that causes concrete to expand and crack, threatening the structural integrity of the lock. (Photo by Elijah Wittum)