FOUNTAIN CITY, Wis. – The Army Corps of Engineers plans to close the single-lane lock at Dam 5A across the Mississippi River between Fountain City and Winona for repairs. The lock will be closed July 19, 21, 26 and 28 from 7 a.m. to 7 p.m. Backed-up barges and excursion riverboats will have priority access each night. Whether the closure will delay or cancel riverboat dockings in Winona and other ports of call was uncertain. The Corps is replacing the lock chamber’s metal gates, which have been damaged and distressed over 90 ears of use.