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A Nepalese Sherpa Dawa Tashi, who was injured during an avalanche gets treatment at a hospital in Katmandu, Nepal, Friday, April 18, 2014. An avalanche swept down a climbing route on Mount Everest early Friday, killing at least 12 Nepalese guides and leaving three missing in the deadliest disaster on the world's highest peak. (AP Photo/Niranjan Shrestha)

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Hospital staff get ready to receive the injured from an avalanche, on helipad of Grandy hospital, in Katmandu, Nepal, Friday, April 18, 2014. An avalanche swept down a climbing route on Mount Everest early Friday, killing at least 12 Nepalese guides and leaving three missing in the deadliest disaster on the world's highest peak. (AP Photo/Niranjan Shrestha)

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FILE - In this Oct. 27, 2011 file photo, the last light of the day sets on Mount Everest as it rises behind Mount Nuptse as seen from Tengboche, in the Himalaya's Khumbu region, Nepal. An avalanche swept the slopes of Mount Everest on Friday, April 18, 2014, along a route used to ascend the world's highest peak, killing at least six Nepalese guides and leaving nine more missing, officials said. (AP Photo/Kevin Frayer, File)

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FILE - in this May 18, 2013 file photo released by mountain guide Adrian Ballinger of Alpenglow Expeditions, a climber pauses on the way to the summit of Mount Everest, in the Khumbu region of the Nepal Himalayas. An avalanche swept down a climbing route on Mount Everest early Friday, April 18, 2014, killing at least 12 Nepalese guides and leaving three missing in the deadliest disaster on the world's highest peak. (AP Photo/Alpenglow Expeditions, Adrian Ballinger, File)

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A Nepalese Sherpa Dawa Tashi, who was injured during an avalanche, gets treatment at a hospital in Katmandu, Nepal, Friday, April 18, 2014. An avalanche swept down a climbing route on Mount Everest early Friday, killing at least 12 Nepalese guides and leaving three missing in the deadliest disaster on the world's highest peak. (AP Photo/Niranjan Shrestha)

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FILE - In this April 20, 2007 file photo, a fishing boat trolls near the intake structure just above the dam on Lake Oahe near Pierre, S.D. Wildlife officials are considering adding Atlantic salmon to Lake Oahe. South Dakota Game, Fish and Parks biologist Bob Hanten says that Atlantic salmon have a number of advantages over the Chinook salmon currently in the lake. He says the overall goal is to increase the number of salmon that anglers catch on the Missouri River reservoir in South Dakota and North Dakota. (AP photo/Chet Brokaw, File)