Cone Zone 6/27/25: Sammamish Traffic Updates

Release Date: 6/27/2025

King County Roads Project

Joints in the metal culvert under the 4600 and 4800 blocks of Sahalee Way NE are failing and water is seeping into the ground, making the soil soft and increasing the danger of slides. Road Services will replace one pipe and rehabilitate another under the road between NE 50th Street and NE 37th Way. This work will require full closure of Sahalee Way NE for five days (June 28 to July 2). All traffic, including emergency vehicles, Metro buses, bicycles, and pedestrians, must use a detour route during the closure. Find updates and details on the project website

Stormwater Pipe Inspection

There are no inspections scheduled the week of June 30, 2025.

Louis Thompson Tightline

There will be upcoming temporary road closure to through-traffic on Louis Thompson Road.  

Louis Thompson Road will be closed to through-traffic between the hours of 9 PM and 6 AM for night work from July 7 - July 11. Comcast will be relocating overhead fiber optic lines. Flaggers will be directing traffic and providing local access to residents. Road signs will direct through-traffic to use alternate routes.

The project webpage can be found here: https://www.sammamish.us/projects/louis-thompson-tightline/

Ziply Fiber Restoration Work

The Ziply permits are currently suspended by the City of Sammamish. Ziply is still allowed to perform restoration work associated with previous construction activities. Restoration activities include soft surface replacement, asphalt patching, and sidewalk replacement.