Still attached to the catamaran barge by the tubular lifting frame, Sill Shell No. 6 is lowered into place beneath the Ohio River Thanksgiving Day. The shell is part of the tainter gate section of the Olmsted Dam under construction between Illinois and Kentucky 17 miles upstream from the Mississippi River. The Olmsted Locks and Dam project will replace locks and dams 52 and 53 and greatly improve commercial navigation along the busiest stretch of water highway in the United States.