May 1, 2019 · On March 22, 2014 at 10:37 am the single deadliest landslide in United States history occurred along SR 530 near Oso, Washington. The slide engulfed an entire community, taking the lives of 43 souls. The Slide Memorial commemorates and educates about the lives lost, a community destroyed, the first responder's and rescuer's heroic efforts, the ...