Oso

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President Barack Obama looks back as he boards Air Force One at Andrews Air Force Base, Md. Tuesday, April 22, 2014, for a flight to Oso, Washington to visit with victims of the deadly March 22 disaster, emergency responders and recovery workers. (AP Photo/Cliff Owen)

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A search worker walks with a tool Wednesday, April 16, 2014, as the search continues for the remaining missing victims of the massive deadly mudslide that hit the community of Oso, Wash., on March 22, 2014. Much of the area currently being searched is only recently accessible due to work done to divert water away from the slide area. (AP Photo/Ted S. Warren)

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In this photo taken Wednesday, April 16, 2014, workers stand near a bulldozer on a berm constructed through the site of the massive deadly mudslide that hit the community of Oso, Wash. on March 22, 2014. Authorities have identified three more bodies pulled from the debris of the mudslide that swept through the Washington town of Oso last month. All 39 victims recovered have been identified, the Snohomish County medical examiner's office said Thursday, April 17, 2014, and four names remain on the list of the missing. (AP Photo/Ted S. Warren)

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A flag rests at half staff on a cedar pole, Wednesday, April 16, 2014, with the face of the massive deadly mudslide that hit the community of Oso, Wash. on March 22, 2014 behind it. The death toll from the massive mudslide that hit the Washington town of Oso last month has risen to 39, officials said Wednesday. (AP Photo/Ted S. Warren)

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A large flag hangs next to instruments used to detect further land movement, Wednesday, April 16, 2014 on the upper edge of the massive deadly mudslide that hit the community of Oso, Wash. on March 22, 2014. The sensors are in place to protect workers searching for missing victims in the slide area below from other landslides. The death toll from the massive mudslide that hit the Washington town of Oso last month has risen to 39, officials said Wednesday. (AP Photo/Ted S. Warren)

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Search workers use a dog to help search a pile of debris, Wednesday, April 16, 2014, at the site of the massive deadly mudslide that hit the community of Oso, Wash. on March 22, 2014. The area being searched is only recently accessible to searchers due to work done to divert water away from the slide area. The death toll from the massive mudslide that hit the Washington town of Oso last month has risen to 39, officials said Wednesday. (AP Photo/Ted S. Warren)

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A search worker uses a dog to help look through a pile of debris, Wednesday, April 16, 2014, at the site of the massive deadly mudslide that hit the community of Oso, Wash. on March 22, 2014. The death toll from the massive mudslide that hit the Washington town of Oso last month has risen to 39, officials said Wednesday. The area being searched is only recently accessible to searchers due to work done to divert water away from the slide area. (AP Photo/Ted S. Warren)

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A search worker walks with a tool Wednesday, April 16, 2014, as the search continues for the remaining missing victims of the massive deadly mudslide that hit the community of Oso, Wash. on March 22, 2014. The death toll from the massive mudslide that hit the Washington town of Oso last month has risen to 39, officials said Wednesday. Much of the area currently being searched is only recently accessible due to work done to divert water away from the slide area. (AP Photo/Ted S. Warren)