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356th Drive SE.
Cracks and settlement on 356th Drive SE near Fall City - larger view JPG 728KB

Summary

King County Road Services is closely monitoring ground movement on 356th Drive SE near Fall City, where a slow-moving slide is taking place under the roadway. On Feb. 10, Road Services, in partnership with the Office of Emergency Management, issued a voluntary evacuation message to residents who would be cut off if conditions worsen and the road washes out. The county does not expect the slide to affect State Route 202.

Status as of Saturday, February 15, 2020

King County Road Services crews will intermittently close 356th Drive SE from noon to 3 p.m. Saturday, Feb. 15, while crews seal cracks on the roadway. The sealant will help prevent rain water from entering the cracks in the road. Drivers should expect delays in both directions of up to 15 minutes at a time while crews are working. Thank you for your patience.

Previous updates

Friday, February 14, 2020

Following a geotechnical evaluation Friday, Feb. 14, King County determined that 356th Drive SE can reopen and remain open unless conditions change.

The road will remain restricted to vehicles that weigh less than 5 tons. Large commercial vehicles and trucks that weigh more than 5 tons are restricted from using this road. There is still a slide risk. King County is monitoring the road’s conditions on a 24/7 basis. Residents should be aware that the road could close at any time. That possibility increases with heavy rains.

Should the road have to close, King County has secured an evacuation route for your neighborhood. We are also working to assure that route can provide access to and from your neighborhood during a potential closure.

The county plans to conduct further testing of the ground underneath the road later this month. That will help us determine how to stabilize the ground on a long-term basis. No date is set for when a long-term repair will take place.

Thursday, February 13, 2020
  • King County will close 356th Drive SE from 9 a.m. to noon, Friday, Feb. 14 to allow our consultant to analyze the slide hazard area. During this period, residents and all other traffic will not be allowed through (vehicles, bicyclists, pedestrians). However, emergency and medical vehicles will still be able to access your neighborhood during this period.
  • We expect to have a status update on the road by Friday afternoon, Feb. 14. There is a possibility the road could be closed immediately, so residents at their homes won’t be able to leave. We are working on an emergency evacuation route from your neighborhood.
Tuesday, February 11, 2020
  • King County will issue a weight limit on 356th Drive SE to prevent heavy commercial trucks from using the road. The road remains safe for passenger vehicles and emergency response vehicles.
  • A soils expert will be at the scene this week to help evaluate the ground conditions.
  • Road Services is monitoring ground movement throughout the day and night, and will close the road if conditions warrant.

Why is King County advising residents to leave the area?

356th Drive SE provides the only access for some 75 homes. The road is currently open but restricted to one lane north of the 4000 block. The ground under the roadway is moving slowly. Heavy rainfall expected this week could accelerate the slide and wash out the road.

Who is affected by this advisory?

Residents who live north of the 4000 block on 356th Drive SE are encouraged to leave the area. Those who live or work south of the 4000 block are not affected at this time.

What should residents in the evacuation area do?

Residents should consider leaving the area as soon as possible. If road conditions worsen and the road is closed or becomes inaccessible, it is likely there will not be another way in or out of the area.

For more information

For information about road conditions on 356th Drive SE, sign up for updates by clicking on the red letter icon on the right side of the page.

To report maintenance and traffic safety issues on this road, contact the 24/7 Road Helpline at 206-477-8100, or 800-527-6237. If it’s an emergency, please contact 911.

For emergency preparedness information, please visit the King County Office of Emergency Management at www.kcemergency.com or call 206-296-3830.

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Contact the 24/7 Road Helpline at 206-477-8100, or 800-527-6237. If it’s an emergency, please contact 911.

For emergency preparedness information, please visit the King County Office of Emergency Management or call 206-296-3830.

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356th Drive SE is restricted to one lane from the 4000 block north to the end of the road. - larger view PDF 412KB

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