Mudslides near Hwy 9 & 240th St. SE, Snohomish County (across from Costco)

Mud slid over the concrete block wall at the Woodinville Business Campus, Hwy 9 & 240th St. SE (across from Costco and below the Wellington Hills Park). Mud & rock debris were also on the train track.

The following photos were taken Dec. 24, 2012.

There were two distinct mudslides.

At time of photos a work crew was placing plastic sheeting on the area behind the wall's edge.

If you draw a straight-line eastward from the two mudslides, the line would go straight into the  Wellington Hills "Park".

I will refer to the two mudslides as "A" and "B".
 "A" is the one closest to 240th St. SE

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Sharon Peterson December 26, 2012 at 11:10 PM
Wow!! What a mess!! This happens year after year on the hillside South of Brightwater near the Wellington Hills Park (formerly the Wellington Hills Golf Course.) What a mess for the railroad and such a danger for the salmon-bearing stream just downhill at Little Bear Creek! Thanks for catching this -- hope Snohomish County and the Department of Ecology have both been notified!
Dale Knapinski December 27, 2012 at 05:36 AM
Snohomish County has been aware of the issues at this commercial site for many years. Officials continue to turn their heads. The sidewalk adjacent to the complex has been closed off since the gigantic walls were built. Creating additional impervious surfaces uphill where the golf course is will only make things worse. Add a little earthquake to this mix and you'll have a real disaster. Yes, they built this monstrosity on a known earthquake fault. If this is an example of how Snohomish deals with steep slopes and water run off…I wouldn’t let them touch the golf course.
Bill Stankus December 27, 2012 at 06:15 AM
The mudslide appears to be composed of sand, mud (silt-sized particles) and a few small round rocks. As I recall, when they back-filled behind the concrete blocks, they used unconsolidated material - meaning there's nothing in the fill to bind the sand, etc. particles together. With enough water, unconsolidated sand/mud is susceptible to flowing down hill. An earthquake beneath unconsolidated sand and clay can cause the fill material to act like a thick liquid.


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