The Oso, Washington mudslide

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Joshua Trujillo/seattlepi.com/AP

President Obama hugs Barbara Tolbert, mayor of Arlington, Wash., as he visits the Oso Fire Station April 22, where he spoke with rescuers near the scene of last month's deadly Oso mudslide.

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David Ryder/Reuters

Casey Larsen waits for President Obama's motorcade to arrive. Obama visited the Washington State community of Oso on April 22, offering condolences to the families of victims, encouragement to rescue workers, and promises of government support.

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Joshua Trujillo/seattlepi.com/AP

Ben Woodward looks up April 21, 2014, at a sign commemorating the moment of the Oso, Wash., mudslide. The wooden memorial is attached to a towering spruce tree, one of the few in the debris field left standing. April 22 marks one month since the huge slide that swallowed homes and killed at least 41 people. Two are still on the missing persons list.

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Marcus Yam/The Seattle Times/AP

Darrington Fire District 24 volunteer firefighters Jeff McClelland (l.), Jan McClelland (c.), and Eric Finzimer embrace one another March 26, 2014, in Darrington, Wash., after saying a prayer for the victims and survivors of the massive mudslide. They were among the first responders to the mudslide that occurred four days earlier.

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NASA/AP

This combination of images provided by NASA shows the Oso, Wash., area on Jan. 18, 2014 (l.) and on March 23, 2014 (r.) after a March 22 landslide sent muddy debris spilling across the north fork of the Stillaguamish River. The debris engulfed numerous homes, resulting in the deaths of at least 41 people.

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Joshua Trujillo/seattlepi.com/AP

A bouquet of flowers left for victims sits perched on the seat of an abandoned vehicle, March 24, 2014, amid the wreckage of homes destroyed by a mudslide, near Oso, Wash., two days earlier. The search for survivors grew to include scores of missing people.

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Jordan Stead/seattlepi.com/AP

Snohomish County residents listen to Washington Gov. Jay Inslee during a news conference outside of the Arlington Police Department on March 23, 2014, in Arlington, Wash. The giant mudslide occurred in Snohomish County.

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Washington State Dept. of Transportation/AP

Widespread damage is evident from a mudslide near Oso, Wash., which struck on Saturday morning, March 22. At least 14 people were killed in the 1-square-mile slide that hit in a rural area about 55 miles northeast of Seattle. Several people were critically injured, and about 30 homes were destroyed.

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Jason Redmond/Reuters

Rescue workers and a search dog head out on March 24 to hunt for missing people caught in a massive landslide along Highway 530 near Darrington, Wash. The confirmed death toll from the mudslide continues to climb, and scores of others were listed as missing two days after the tragedy, authorities said.

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Jordan Stead/seattlepi.com/AP

Oso, Wash., residents Freda Slack (l.) and husband, Pat (r.), evacuated but returned home after hearing of decreased flooding risk March 23, 2014. A huge mudslide had clogged the nearby river, causing water upstream to back up and threaten massive flooding.

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Genna Martin/The Herald/AP

Natalie Reed (r.) holds daughter Deja Reed, 5, during a March 24, 2014, prayer service at the Arlington United Church, for those affected by the Oso, Wash., mudslide.

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Elaine Thompson/AP

A news person photographs a map showing the location of a March 22 mudslide, while waiting for the start of a news conference on March 24 in Arlington, Wash. Officials said they have 108 names on the list of the missing – a number that would grow to 176 in less than 24 hours.

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Dan Bates/The Herald/AP

Volunteers turned out March 24, 2014, to help with the search for missing people in Oso, Wash.

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Jordan Stead/seattlepi.com/AP

Barbara Welsh (c.), a mudslide victim whose husband is missing, is comforted by Washington Gov. Jay Inslee (r.) after a news conference outside of the Arlington Police Department, March 23, 2014, in Arlington, Wash.

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Mark Harrison/ The Seattle Times/AP

Claire Logan (r.) carries supplies to help set up an evacuation center at Post Middle School in Arlington, Wash., to help those affected by the landslide on the north fork of the Stillaguamish River on March 22, 2014.

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Genna Martin /The Herald/AP

A day after a gigantic mudslide occurred near Oso, Wash., a woman holds family photos pulled from the rubble at the site.

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Annie Mulligan/The Herald/AP

Mikeal Blake O'Sullivan stands in the window of PaZazz! hair salon in downtown Arlington, Wash., on March 24, 2014. The boy's grandmother, Anita O'Sullivan, owns the salon and is donating money to mudslide relief efforts.

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Genna Martin/The Herald/AP

A helicopter flies low over the mudslide-affected area March 23, 2014, in Oso, Wash.

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Mark Mulligan/The Herald/AP

Residents watch from the Whitman Road bridge as debris comes down the Stillaguamish River east of Oso, Wash., March 23, 2014.

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Sofia Jaramillo/The Herald/AP

LoAnna Langton receives diapers from Amanda Davidson, who set up a Facebook fundraiser for victims of the slide, at the Community Center in Darrington, Wash., on March 24, 2014.