The U.S. Army Corps of Engineers, Rock Island District, announces the auxiliary lock, located at Locks and Dam 14 in Pleasant Valley, Iowa, will open May 27 for recreational boating traffic. Every weekend until Sept. 5, the lock will be open for recreational use on Fridays from 4-10 p.m. and Saturdays and Sundays from Noon-10 p.m. In addition, the auxiliary lock will be open Noon-10 p.m. on the Memorial Day, 4th of July, and Labor Day holidays and until midnight on Friday, August 12, to assist recreational boaters attending Tugfest activities and the fireworks display.