Snohomish County wins key battle in Oso mudslide lawsuit

OSO — A King County judge this week significantly reduced the ability of people harmed in the Oso mudslide to claim Snohomish County officials failed to adequately warn them of the risks connected to where they made their homes.

In a written ruling Monday, King County Superior Court Judge Roger Rogoff held that only those who attended a March 2006 meeting, or those “who relied on the substance” of information shared at that meeting, can press claims that they were insufficiently warned.

Snohomish County officials called the 2006 meeting with people who lived in the Steelhead Haven neighborhood to discuss flooding and other risks after a slide blocked the North Fork Stillaguamish River that year.

Plaintiffs’ lawyers contend the county called the meeting to warn about landslide risks. The county, meanwhile, claims that people at the meeting were told the government no longer would provide them with protection from likely future flooding. It also asserts that landslide activity linked to that flooding was unpredictable.

The law is clear that the county only can be held responsible for what it promised to do, Rogoff ruled.

“No evidence exists that the county promised to monitor the slide, further investigate the slide or do any other act that would enhance its warning abilities,” the judge wrote. “The county owed no duty to engage in further affirmative acts to improve its ability to warn. Rather, the county owed a duty to adequately warn the residents of Steelhead Haven based upon the information they had at the time they affirmatively acted to do so.”

In all, 43 people were killed and dozens of others injured in March 2014 when a wall of mud and trees raced across the Stillaguamish River valley.

Lawyers representing the families of those harmed have argued that county officials knew, or should have known, that the hillside above Steelhead Haven was dangerously unstable. Key to their claim are numerous studies of slides at the site, some dating back decades.

The county has countered that none of the reports gave them a clear warning that the hillside was poised to collapse in 2014 with such disastrous consequences. Moreover, the county and other parties being sued contend there was more opinion than science behind one expert’s 1999 report that hinted at the potential for a huge slide.

The Oso litigation is believed to be the state’s largest-ever wrongful death case. Karen Willie, one of the attorneys representing the plaintiffs’ families, declined to talk about the implications of this week’s ruling.

“I am not comfortable discussing a judge’s order when there’s active litigation,” Willie said.

Earlier in June, the judge ruled that the county, state and a timber company being sued in the case may ask jurors to consider that the disaster was an “act of God,” and that those harmed may also bear some responsibility through contributory negligence.

Trial in the case is set for fall.

Attorneys for the state and county earlier asked for more time to consider the results of drilling that state experts conducted over the past year in an effort to better understand the geology of the hillside and how water moved through the ground. The work has raised questions about some widely held theories, including the suggestion that logging over the years was a primary reason that water saturated the hillside and triggered a collapse.

Scientific examinations of the area since the 2014 slide paint a complex picture, including signs that similar giant slides have occurred repeatedly in that valley since the Ice Age.

Scott North: 425-339-3431; north@heraldnet.com. Twitter: @snorthnews.

Talk to us

> Give us your news tips.

> Send us a letter to the editor.

> More Herald contact information.

More in Local News

Snohomish County Health Department Director Dennis Worsham on Tuesday, June 11, 2024 in Everett, Washington. (Olivia Vanni / The Herald)
Snohomish County Health Department director tapped as WA health secretary

Dennis Worsham became the first director of the county health department in January 2023. His last day will be July 3.

‘No Kings’ rallies draw thousands to Everett and throughout Snohomish County

Demonstrations were held nationwide to protest what organizers say is overreach by President Donald Trump and his administration.

Police Cmdr. Scott King answers questions about the Flock Safety license plate camera system on Thursday, June 5, 2025 in Mountlake Terrace, Washington. (Olivia Vanni / The Herald)
Mountlake Terrace approves Flock camera system after public pushback

The council approved the $54,000 license plate camera system agreement by a vote of 5-2.

Cascadia College Earth and Environmental Sciences Professor Midori Sakura looks in the surrounding trees for wildlife at the North Creek Wetlands on Wednesday, June 4, 2025 in Bothell, Washington. (Olivia Vanni / The Herald)
Cascadia College ecology students teach about the importance of wetlands

To wrap up the term, students took family and friends on a guided tour of the North Creek wetlands.

Community members gather for the dedication of the Oso Landslide Memorial following the ten-year remembrance of the slide on Friday, March 22, 2024, at the Oso Landslide Memorial in Oso, Washington. (Ryan Berry / The Herald)
The Daily Herald garners 6 awards from regional journalism competition

The awards recognize the best in journalism from media outlets across Alaska, Idaho, Montana, Oregon and Washington.

Edmonds Mayor Mike Rosen goes through an informational slideshow about the current budget situation in Edmonds during a roundtable event at the Edmonds Waterfront Center on Monday, April 7, 2025 in Edmonds, Washington. (Olivia Vanni / The Herald)
Edmonds mayor recommends $19M levy lid lift for November

The city’s biennial budget assumed a $6 million levy lid lift. The final levy amount is up to the City Council.

A firefighting helicopter carries a bucket of water from a nearby river to the Bolt Creek Fire on Saturday, Sep. 10, 2022, on U.S. 2 near Index, Washington. (Ryan Berry / The Herald)
How Snohomish County property owners can prepare for wildfire season

Clean your roofs, gutters and flammable material while completing a 5-foot-buffer around your house.

(City of Everett)
Everett’s possible new stadium has a possible price tag

City staff said a stadium could be built for $82 million, lower than previous estimates. Bonds and private investment would pay for most of it.

Jennifer Humelo, right, hugs Art Cass outside of Full Life Care Snohomish County on Wednesday, May 28, 2025 in Everett, Washington. (Olivia Vanni / The Herald)
‘I’ll lose everything’: Snohomish County’s only adult day health center to close

Full Life Care in Everett, which supports adults with disabilities, will shut its doors July 19 due to state funding challenges.

Marysville is planning a new indoor sports facility, 350 apartments and a sizable hotel east of Ebey Waterfront Park. (Olivia Vanni / The Herald)
New report shifts outlook of $25M Marysville sports complex

A report found a conceptual 100,000-square-foot sports complex may require public investment to pencil out.

Logo for news use featuring Snohomish County, Washington. 220118
Snohomish County Board of Health looking to fill vacancy

The county is accepting applications until the board seat is filled.

A recently finished log jam is visible along the Pilchuck River as a helicopter hovers in the distance to pick up a tree for another log jam up river on Wednesday, June 11, 2025 in Granite Falls, Washington. (Olivia Vanni / The Herald)
Tulalip Tribes and DNR team up on salmon restoration project along the Pilchuck River

Tulalip Tribes and the state Department of Natural Resources are creating 30 log jams on the Upper Pilchuck River for salmon habitat.

Support local journalism

If you value local news, make a gift now to support the trusted journalism you get in The Daily Herald. Donations processed in this system are not tax deductible.