Contractors are hoisted aloft to check the power head atop the 120-foot mast of the wind turbine during final assembly March 13, 2013, at Black Butte Lake, a U.S. Army Corps of Engineers Sacramento District park near Orland, Calif. Expected to go online within 30 days, the turbine can generate 11 kilowatts of energy and will help supply the needs of campers in the park.