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A catastrophic landslide in Oso, Washington -- a state dotted with landslide-prone slopes -- in March 2014 traveled more than 3,000 feet from its base, in the process burying a community and killing 43 people. A joint KUOW-Earthfix investigation found that most of Washington's counties routinely allow homes to be built 50 feet or less from known landslide zones, although landslides commonly travel hundreds of feet.