The deadliest landslide in United States history was the catastrophic Oso landslide, which occurred on March 22, 2014, near Oso, Washington. A rain-soaked hillside collapsed suddenly, sending roughly 18 million tons of mud, soil, and debris racing across the North Fork Stillaguamish River and completely obliterating the Steelhead Haven residential neighborhood. The massive, destructive mudflow destroyed dozens of homes and tragically claimed the lives of 43 people, prompting extensive federal emergency disaster response efforts.
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