The catamaran barge lowers the third of six 2,000-ton lower pier shells into the Ohio River Sept. 8 during construction of the dam phase of the Olmsted Locks and Dam project. The steel reinforced concrete shells are part of the tainter gate section of the dam being built 17 miles upstream of the confluence of the Ohio and Mississippi rivers on the busiest stretch in America of the inland waterways. (U.S. Army Corps of Engineers photo by Bill Gilmour)