Ben Woodward looks up at a sign commemorating the moment of the Oso mudslide. The wooden memorial was attached to a towering spruce tree, one of the few in the debris field left standing after the disaster. Photo: Joshua Trujillo/AP

Marine One helicopter, carrying President Barack Obama, takes an aerial tour of Oso, above the site of the deadly mudslide that struck the community in March. Photograph: Carolyn Kaster/AP

President Obama shakes hands with Washington Governor Jay Inslee, before touring the mud slide damage in Oso. Photograph: Larry Downing /Reuters

People wave and take photos as President Barack Obama's motorcade drives past. Photograph: Elaine Thompson /AP

Brande Taylor and her partner Matt Ingison wave flags and take photos as President Obama's motorcade drives past in Oso. Photo: Elaine Thompson/AP