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Today in History: Oso landslide claims 43 lives in U.S. tragedy

3/22/2026

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Summary

Story summary

On March 22, 2014, a devastating landslide struck Oso, Washington, at 10:37 a.m., killing 43 people. The collapse of an unstable hill sent mud and debris across the North Fork of the Stillaguamish River, engulfing a rural neighborhood and destroying 49 homes. This incident remains the deadliest standalone landslide in U.S. history.

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Story summary

On March 22, 2014, a devastating landslide struck Oso, Washington, at 10:37 a.m., killing 43 people. The collapse of an unstable hill sent mud and debris across the North Fork of the Stillaguamish River, engulfing a rural neighborhood and destroying 49 homes. This incident remains the deadliest standalone landslide in U.S. history.