The U.S. Army Corps of Engineers, Rock Island District, will close a portion of Highway T-15 that traverses Lake Red Rock dam and the North Tailwater Recreation Area, May 31 through June 2 from 9 a.m.-4 p.m. to allow for inspections and survey work on the dam. A signed detour will be in place for those traveling between Pella and Knoxville, Iowa. The Lake Red Rock Visitor Center, North Overlook and South Tailwater Recreation Areas will remain accessible during the closure.