Oso, Washington Landslide
On Saturday, March 22, 2014, at about 11:00am PDT, a large landslide occurred near Oso, Washington, located in the northwestern portion of the state.  According to the USGS, "Recent rain conditions and soil saturation led to the onset of the landslide."  Debris from the landslide "covered about 30 houses and 0.8 miles of State Route 530." The resulting debris field is is "as deep as 60 to 75 feet in some places....[and] [i]n many places it is 15 to 25 feet deep.'  As of April 1, 2014, there are 27 confirmed victims of the landslide and 22 people are still considered missing.  Some websites, including the Snohomish County website, refer to the event as the SR 530 Landslide.
This area has been the subject of geological review since the 1950s. According to the Seattle Times, "The hill that collapsed last weekend is referred to by geologists with different names, including Hazel Landslide and Steelhead Haven Landslide, a reference to the hillside's constant movement. Some residents, according to a 1967 Seattle Times story, referred to it simply as 'Slide Hill.'" 
 Jessica Robertson, Landslide in Washington State: USGS is Working with Partners to Provide Up-to-Date Information, USGS Science for a Changing World (Apr. 1, 2014 9:45 AM), http://www.usgs.gov/blogs/features/usgs_top_story/landslide-in-washington-state/.
 Matt Pearce, Washington Mudslide Death Toll at 27; Some Victims Still Unidentified, Los Angeles Times, Apr. 1, 2014, http://www.latimes.com/nation/nationnow/la-na-nn-washington-mudslide-toll-20140401,0,3366518.story#ixzz30BRFPMbC.
 KGW.com Staff et al., Oso Mudslide Search Winding Down; 2 Still Missing (Apr. 25, 2014 10:14 AM), http://www.kgw.com/news/8-dead-voices-crying-for-help-stop-in-Washington-mudslide-251945091.html.
 530 Slide News & Resources, Snohomish County Washington, http://snohomishcountywa.gov/2354/530-Slide (last visited Apr. 1, 2014).
 Ken Armstrong, Mike Carter & Mike Baker, Risk of Slide 'Unforseen'? Warnings Go Back Decades, Seattle TImes, Mar. 25, 2014, http://seattletimes.com/html/localnews/2023218573_mudslidewarningsxml.html.