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>> 356th Drive SE slide hazard webpage

Monday, March 30, 2020

Due to over an inch of rain in the last 48 hours, the weight limit on 356th Drive SE is reduced from 15 tons to 5 tons.

Monday, March 23, 2020

356th Slide Update: Call-in Community Meeting, 7-8 p.m., Wednesday, March 25

Wednesday, March 25, from 7 to 8 p.m.
Community members will be able to access the meeting by phone.
How to join the meeting
Audio-only: Call from any type of phone (mobile, land line or internet calling system)
1. Call: 206-263-8114
2. Enter the Conference ID: 4834239

We will open the teleconference at 6:55 p.m. however the meeting won’t begin until 7 p.m. If there are any specific questions you would like us to answer during the community meeting, please email or call/text Broch (pronounced “Brock”) Bender at 206-584-6174.

Wednesday, March 18, 2020

Vehicle weight limit increases to 15 tons during dry weather
King County has increased the vehicle weight limit on 356th Drive SE from five tons to 15 tons. This greater weight limit will only be in effect when the ground is dry. During rainy weather and for 48 hours after rain stops, the vehicle weight limit goes back to five tons. Road crews will post a changeable flip sign at the slide area. Crews will change the sign to either five tons or 15 tons, depending on ground conditions. This change will allow access to the neighborhood by heavier service delivery trucks. For more information, please contact or visit the FAQ section of this website.

Friday, March 6, 2020

The soil testing analysis for 356th Drive SE is underway. We expect to have the full report later this month or in early April. The report is one of the tools the county will use to help determine whether we need to change the current 5-ton weight limit restriction on this road, which remains in place until further notice.

In addition, garbage service remains up to residents to self-haul to collection sites because of the prohibitive weight of the trucks - more information in the frequently-asked questions.

Tuesday, February 25, 2020

King County will close 356th Drive SE to all vehicle traffic from 8:30 a.m. until 5 p.m. today through Thursday, February 27, for soil testing work. Residents may park a vehicle on the other side of the closure while crews are working, and crews will allow limited access for foot and bicycle traffic throughout the day. Please note: The evacuation route that was put into place earlier this month is on private property, and will not be available for residential use when 356th Drive SE is closed for soil testing this week. The county will maintain access for life and safety emergency response vehicles while crews are working.

Friday, February 21, 2020

King County will conduct full closures of 356th Drive SE next week so crews can continue testing the slide area. From 8:30 a.m. to 5 p.m., February 25-27, the road will be closed to all vehicles.

During the closures, crews will use a large drill rig and work on both sides of the road. This work 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.

During the work, vehicles will not be allowed in or out of the affected neighborhood. For safety reasons, pedestrian and non-motorized access through the work zone will be limited. Residents can park a vehicle on the other side of the closure, but foot and bicycle traffic may have to wait up to 15 minutes to gain access to the other side. King County will maintain access only for emergency vehicles, if needed, during this closure.

Tuesday, February 18, 2020

Over Presidents’ Day weekend, King County crews completed work on an evacuation route and sealed cracks in the roadway on 356th Drive SE. The evacuation route is on private property and would only be accessed if 356th Drive SE closes. Crack seals help extend the life of the existing roadway by preventing water from undermining the roadway.

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.

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.

>> 356th Drive SE slide hazard webpage