A crane lowers one of two refurbished lock gates into place at the Great Bridge Lock here Feb. 20, 2014 as part of a service plan to increase the lifespan of the lock. The Great Bridge Lock gates, which were constructed by the Corps in 1932, are part of the eight sets of gates throughout the Albemarle and Chesapeake Canal waterway. Each set of canal gates, which are managed and operated by the Norfolk District, is removed and refurbished on a rotational basis every 15 to 20 years. The Albemarle and Chesapeake Canal together with the Dismal Swamp Canal form the historic Atlantic Intracoastal Waterway, which provides pleasure boaters and commercial shippers with a protected inland channel between Norfolk, Va. and Miami, Fla.