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A mudslide hit Oso, Washington on March 22, 2014, devastating a small, remote community. NBC News covers the victims, first responders and others who have been personally affected by the tragedy, as well as the science behind the slide.

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Washington Reaches $50 Million Settlement in 2014 Oso Mudslide That Killed 43 Washington Reaches $50 Million Settlement in 2014 Oso Mudslide That Killed 43 Washington Reaches $50 Million Settlement in 2014 Oso Mudslide That Killed 43 Washington Reaches $50 Million Settlement in 2014 Oso Mudslide That Killed 43

Washington Settles Fatal 2014 Oso Mudslide for $50 Million

Ted S. Warren / AP
Anonymous Donor Pays Oso Mudslide Victim's Mortgage Anonymous Donor Pays Oso Mudslide Victim's Mortgage Anonymous Donor Pays Oso Mudslide Victim's Mortgage

Anonymous Donor Pays Oso Mudslide Victim's Mortgage

MATT MILLS MCKNIGHT / EPA
Oso Mudslide: Residents Remember Tragedy One Year Later Oso Mudslide: Residents Remember Tragedy One Year Later Oso Mudslide: Residents Remember Tragedy One Year Later

'Moving Forward': The Deadly Oso Mudslide, One Year Later

Duke Suddarth, Infant Boy Who Survived Oso Mudslide, Defies the Odds

Oso Mudslide: Lawsuit Blames State, Logging Company for Deadly Disaster

Mudslide-Ravaged Highway in Oso Reopens After Six Months

Last Body in Oso, Washington, Mudslide Reported Found

Washington Mudslide Families File Wrongful Death, Damage Claims

Body Found at Scene of Devastating Washington Mudslide

Dozens of Washington Schools at High Risk of Landslide: State

Officials End Active Search at Washington Landslide With 2 Still Missing

County Officials in Washington Landslide Area to Consider Building Ban

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Obama Visits Grieving Oso Community After Mudslide

Obama Praises Town's Strength Following Deadly Mudslide

Washington Mudslide Death Toll Up to 41

Washington Mudslide: Thirty-Nine Victims Now Identified

Washington Mudslide Death Toll Rises to 39

Washington Mudslide Death Toll Rises to 37

Isolated Town Still Waits for Slide-Wrecked Road to Open

Four More Mudslide Victims Identified, Seven Remain Missing

A Snapshot of How Those Killed In Mudslide Lived

Washington Mudslide Death Toll Rises to 36, 32 Identified

Mother Who Survived Washington Mudslide Describes Harrowing Ordeal

60 Seconds of Terror: Animation Shows Deadly Mudslide's Surge

Death Toll in Washington Mudslide Climbs to 35, 31 Identified

White House Says Obama Will Visit Town Wrecked by Mudslide

Navy Chief Latest Fatality ID'd in Washington Mudslide

'God Has Not Forgotten Us': Slide Victims' Services Begin

Fire Chief Opens Door on Mudslide's Emotional Trauma

Number of People Missing in Landslide Falls Again

Mudslide Survivors Stunned at Damage: Should They Have Been Warned?

Reports Recommended Moving Homes From Washington Landslide Area

Death Toll in Washington Mudslide Rises to 30

Washington Mudslide Death Toll Rises to 29

Seattle's Sports Teams Go to Bat for Washington Mudslide Victims

'Almost Nonexistent' Chance of Washington Mudslide Survivors

'Really Cut Off': Mudslide Neighbors Struggle With Highway Closure

Funeral Home Near Washington Mudslide Copes with Burying More Dead

Mudslide Death Toll Rises to 28

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New Satellite Image Shows Vast Reach of Oso Mudslide

Mudslide Claimed Three Generations of One Family

Death Toll Climbs to 27 in Washington Mudslide

Mudslide Work Takes Toll on Medical Examiner's Office

Washington Mudslide Kin Need Help to Pay for Funerals: Governor

22 Identified as Missing After Washington Mudslide

Crews Unable to Remove Mud from Slide Site

Weather Conditions Improve for Mudslide Search, but Contaminants Remain

Death Toll From Washington Mudslide Rises to At Least 21

Churchgoers Pray for Mudslide Victims as Death Toll Climbs

Small-Town Washington Mayor Finds New Role After Mudslide

Limits to Development: When Should You Avoid Building at All Costs?

Number of Missing in Mudslide Drops Sharply as Death Toll Rises

Rain and Chemical Contamination Hinder Mudslide Search Efforts

Small but Resilient Oso Will Rebuild After Mudslide, Residents Say

Lives Lost: Eight Victims Identified in Washington Mudslide

'Very, Very Difficult' ID Process Slows News for Families

Washington Mudslide: Learn How to Help

Mudslide Relief Donations Top $1.5 Million

Double-Barreled Blow: How the Oso Mudslide Went Down

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Muddy Search Dog Rests After Hard Day's Work in Oso Recovery Effort

Colorado Sending National Guard to Join Mudslide Search

Mudslide Victim Wanted Right to Live Anywhere He Wanted

What Started the Mudslide? Satellite Image May Offer New Clues

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Rescuers Keep Searching Despite Overwhelming Obstacles

Death Toll in Washington Mudslide Expected to Soar

Vietnam Vet William Welsh Is Confirmed as Latest Mudslide Victim

Spouses, Children, Nature Lovers: Who Are the Mudslide's Missing?

Official Washington Mudslide Death Toll Rises to 17

More Heavy Equipment Works Slide Site, But Dead, Missing Unchanged

Baby Sanoah's Body Found in Mudslide Wreckage

'A Sense of Relief': Body of Mudslide Victim Summer Raffo Found

Mudslide Search Team Shares Heartbreaking Stories

Family Who Once Escaped Fire is 'Grateful' After Surviving Mudslide

Fire Chief's Heart Tells Him There Could Be Mudslide Survivors

Governor Says Town Near Washington Mudslide Is 'a Family'

#AskNBCNews: Your Washington Mudslide Questions Answered

'We'll Find Her': Mom Searches for 4-Month-Old in Mudslide

Mudslide Missing: One Nature Lover's Heaven Became Hell

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New Photos Show Different Angles on Mudslide Destruction

Most Locals Aware of Mudslide Risk in 'Little Piece of Paradise'

Number of Missing or Unaccounted For in Mudslide Drops to 90

First Washington Mudslide Fatality Is Formally Identified

Mudslide Survivor Thanks Her Rescuer With Big Hug

Mudslide Search: Cousin Flies to Washington to Find His Family

Chief Pilot Says 'No Signs' of Life in Mudslide Debris

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Fatal Washington Mudslide Impact Seen From Space

Mudslide Victim Linda McPherson Was 'Very Giving Person'

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Mudslide Wipes Away Landscape, Leaving Only Memories

Emergency Chief: Sometimes Massive Mudslides 'Just Happen'

How Washington Mudslide Victims Are Getting Help

Washington Mudslide Survivor 'Took 6 Breaths,' Started Digging

Eight Questions About the Washington Mudslide

Brothers, Son Recover Mudslide Victim's Body From Debris

Did Tiny Quake Cause Mudslide Or Should Officials Have Seen It Coming?

Two More Bodies Recovered From Mudslide Scene

Missing in the Mudslide: A Brother's Mission to Find His Sister

911 Caller After Mudslide: 'The Houses Are Gone!'

Families of Missing in Mudslide Cling to Dimming Hopes

Mudslide Death Toll Likely to Rise Today: Fire Chief