North Beach CSO Control ProjectProject areaKing County is designing and building an underground storage pipeline in the right-of-way in N.W. Blue Ridge Drive and Triton Drive N.W. This facility will store peak flows when the North Beach Pump Station reaches maximum capacity. After storms have passed, an underground pump will transfer stored flows to the pump station for conveyance to King County’s Carkeek Wet Weather Treatment Facility for transfer to West Point Treatment Plant or onsite treatment. The project includes an underground diversion structure that will convey peak flows to the facility. There will be a new odor control and electrical facility on King County property. 
Project area and elements (PDF)
Project elements
N.W. Blue Ridge Drive (looking east)
N.W. Blue Ridge Drive (looking northeast)
The North Beach CSO control facility will be built in the right-of-way on N.W. Blue Ridge Drive and Triton Drive N.W., and on King County’s North Beach Pump Station property. Community input will help to inform design of the ancillary equipment facility and landscape restoration. - An underground diversion structure located on King County property
- A pipe connecting the diversion structure to the storage pipeline to convey peak flows during a wet weather event
- Parallel underground storage pipelines approximately 230 lineal feet and 11 feet inside diameter, located in the right-of-way
- Access hatches in the right-of-way for operations and maintenance activities
- Two underground structures at each end of the pipeline; on the north end, the structure will include pipeline cleaning and isolation equipment; on the south end, the structure will include small pumps to discharge stored flows after storms have passed
- A pipe connecting the storage pipeline to the sewer to return wastewater to the pump station after the wet weather event
- An ancillary equipment facility including odor control and electrical facilities, located on King County property. The building will be one story, and the height will comply with city code
- An additional driveway for safer access for operations and maintenance
- Restoration of the right-of-way in accordance with permit conditions
- Restoration of landscaping on King County’s property
Learn how the underground storage pipeline will work to limit discharges of untreated wastewater and stormwater to Puget Sound. Learn more about work occurring on King County property and in the street. Community inputWorking with the community during the planning and early design phases of the North Beach CSO Control Project, King County has identified neighborhood concerns. The project team will continue to work with the community to address these concerns as we continue through design and throughout construction. - Maintaining access to Blue Ridge Park access
- Bus routes during construction
- Construction traffic and worker parking
- Final site appearance
- Length of construction
- Limiting construction impacts:
- Lights and glare
- Noise and vibration
- Odors
- Traffic impacts
- Operations and maintenance activities
- Parking and residential access
- Pedestrian access
- Road construction and restoration
- Staging areas
- Surface water management during and after construction
- Work hours
View the North Beach CSO Control Project Timeline for more opportunities to participate.
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