North Creek Interceptor Project

The project

June 2013 Update -- What you should know about overflows from the North Creek Interceptor

To protect public health and the environment and enable planned growth, King County is upgrading a major sewer line serving southeast Snohomish County and Bothell since 1970. King County aquired the North Creek Interceptor from the Alderwood Water & Wastewater District in 2001. During heavy storms last winter, high water volumes caused several manholes along the 43-year-old line to overflow into North Creek. Construction on a long-range plan to add capacity to the line to accommodate population growth will begin in 2014. In the meantime, County staff have begun a series of short-term inspection, repair and maintenance projects to prevent overflows and backups. This summer, County crews will repair several manholes near North Creek and Centennial parks. Neighbors will be notified before work begins. King County will coordinate closely with the state Department of Ecology on these vital projects. For more information, view Fact Sheet (June 2013).

May 10, 2013 Update --

King County is continuing to make progress inspecting the County’s sewer lines, identifying sources of stormwater entering the system, and helping to reduce potential for backups into homes. In May, the County’s contractor will install temporary devices to convey sewage from some homes to the County’s North Creek Interceptor located under 14th Drive SE in Bothell. For more information, visit the maintenance and repair page. 

Vicinity Map for North Creek Interceptor Project

King County is completing design of the NCI Project, which includes replacement of a main wastewater conveyance pipeline which serves parts of Bothell and unincorporated Snohomish County.

The project includes construction of approximately 10,000 feet of new sewer line, along with connecting this new line to previously constructed pipe. This new pipeline ranges from 30 to 48 inches in diameter. Construction will take place in both the City of Bothell and unincorporated Snohomish County. The project team will work closely with project neighbors to keep people informed about activities and schedule, and to address questions and concerns about construction activities.

Construction will take place at different locations in both the City of Bothell and in unincorporated Snohomish County.

Need for project

This pipeline is an integral part of the regional wastewater system that carries flows from local jurisdictions to King County’s treatment plants. Upgrades are necessary to provide additional capacity for home and businesses and to ensure safe and reliable operations for the future.

Summary of project schedule

The project is now in final design and is tentatively scheduled for construction starting in late 2014.

• Environmental review will be completed in Spring 2013
• Final Design and permitting: through late 2013
• Advertise construction contract: 2014
• Construction to begin: 2014    

Being a good neighbor

King County is committed to being a good neighbor and will work directly with the community throughout the project to minimize construction impacts whenever possible. Residents can expect:

• Advance notice of construction activities – mail, email, phone, door hangers
• One-on-one problem solving with residents directly impacted by construction activities
• Project website and construction updates
• 24-hour project construction information line