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On Saturday, March 22, 2014, at 10:37 a.m. local time, a major mudslide occurred 4 miles (6.4 km) east of Oso, Washington. A portion of an unstable hill collapsed, sending mud and debris across the North Fork of the Stillaguamish River, engulfing a rural neighborhood, and covering an area of approximately 1 square mile. [These details courtesy of Wikipedia] 

This page includes information about that slide as well as related information.

Information on Landslides

Oso Landslide

Washington State Patrol photo from Wikimedia

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