This is Wolf Creek Dam in Jamestown, Ky., Feb. 8, 2012. The U.S. Army Corps of Engineers Nashville District is installing a concrete barrier wall to stop seepage at the dam. The Corps, in partnership with the contractor Treviicos-Soletanche Joint Venture, amassed 700,000 maintenance hours over the past year without a lost-time accident, a notable safety achievement. (USACE photo by Leon Roberts)