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Soil testing work to impact traffic on Coal Creek Parkway through late February


Work to collect soil samples along the proposed alignment for a King County replacement sewer line between Bellevue and Newcastle will require temporary travel lane closures along Coal Creek Parkway through late February.


Motorists and cyclists using Coal Creek Parkway between Bellevue and Newcastle should expect temporary traffic impacts through late February as King County utility crews begin soil testing work as part of a regional sewer improvement project.

While construction on the Coal Creek Trunk sewer upgrade isn’t expected to begin until 2021, crews are now drilling test holes to help determine soil conditions along the new line’s recommended alignment.

The work is expected to take about five weeks to complete and will require travel lane, bicycle lane and sidewalk closures near drilling locations from 7 a.m. to 3:30 p.m., Monday through Friday. Some work could also occur on weekends to minimize weekday traffic impacts.

During the project, people should expect equipment in the roadway and noise from the drill rigs, which may be parked on the shoulder overnight when not in use. Drivers are asked to drive slowly in the area, obey posted signage and watch for pedestrians, bicyclists and workers.

King County will post regular project updates at For additional information, text KING COALCREEK to 468-311, or contact Monica Van der Vieren at 206-477-5502 or