A UH-60 Black Hawk helicopter prepares to drop a 1-ton sandbag. A UH-60 Black Hawk helicopter from the 1-112th Aviation Battalion, North Dakota National Guard, Bismarck, N.D., prepares to drop a 1-ton sandbag in the washed out portion of the emergency spillway of the Cottonwood Springs Dam, also called Lake LaMoure, near LaMoure, N.D., on April 19, 2009. The spillway is eroding and releasing more water than it was designed to release. National Guard helicopters are being used to lessen the damage to the spillway. The sandbags are being used to create a tier system so the water slows down and forms into different pools below the waterfall. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 775098-C-OCX34-050.jpg Photo Gallery