The project team is available to meet with you or come to your next community event. The project team will share the latest project information and discuss impacts to the community. To schedule, contact Project Manager, Prabhat Karna at pkarna@bellevuewa.gov.
The City of Bellevue’s Capital Improvement Program includes projects to ensure safe, reliable water is delivered to our customers. As part of this program, the City must replace the Clyde Hill Pump Station, either rehabilitate or replace the Clyde Hill 390 Reservoir, and plan for future replacement of the Clyde Hill 465 Reservoir.
Why is This Project Needed
The Clyde Hill 390 and 465 Reservoirs serve the BV400 pressure zone, which includes the rapidly growing downtown area and is the second largest pressure zone in the City’s system. As the City continues to experience significant population growth, additional storage in the reservoir allows the City to consistently serve new customers.
Both the 390 Reservoir and pump station facilities are aging and face significant structural, operational, and capacity challenges. Seismic upgrades are needed for the Clyde Hill 390 Reservoir to protect the tank in the event of an earthquake. Similarly, the Clyde Hill Pump Station contains outdated and deteriorating components and is also likely to fail in the event of an earthquake, the pump station will be replaced with a new pump station. Additionally, the Clyde Hill pump station is located within feet of the reservoir, causing potential conflicts with any major reservoir work.
The Clyde Hill 465 Reservoir is a 100‑foot‑tall, 36‑foot‑diameter steel standpipe built in 1958 with a storage capacity of 0.75 million gallons. It is currently filled by the Clyde Hill Pump Station and provides backup storage to the BV400 pressure zone. While the 2025 upgrades extended its service life, the reservoir will still require full replacement in the future. Because the site has significant spatial constraints, the City determined that future replacement scenarios for the Clyde Hill 465 Reservoir must be incorporated into this project’s alternative analysis. This helps ensure that the facilities in the project vicinity are best leveraged to meet the long term needs of the water system.
Project Location
The Clyde Hill 390 Reservoir is a 4-million-gallon (MG) above-ground prestressed concrete reservoir built in 1970 and is located at 2115 96th Ave NE in the City of Clyde Hill adjacent to Chinook Middle School’s track, Clyde Hill Elementary School, Clyde Hill City Park, Clyde Hill Public Works Shop, residential neighborhoods, the City of Bellevue’s Clyde Hill Pump Station, and the City of Bellevue’s Clyde Hill 465 Reservoir. The 390 Reservoir also supports the CL500 zone via the adjacent Clyde Hill Pump Station. Constructed in 1969, the pump station is the only facility serving the closed CL500 zone.
In 2025, the park underwent walkway improvements, and the 465 Reservoir received upgrades, including a new vent and a full interior recoating.
Project Timeline and Preliminary Schedule
Please refer to the schedule below for a snapshot of the project timeline and what to expect over the next few years. The city will provide further communication about the project status and anticipated impacts at later stages.
- Business Case Analysis (BCA): May 2025 – September 2026
- Design and Permitting: To be determined pending the results of the BCA
- Construction: Schedule pending design and permitting completion
Project Impacts
Although a construction schedule is not yet known, there are several impacts the community can expect once work begins. During construction, residents can anticipate the presence of construction equipment, increased truck traffic, and associated noise in the area adjacent to Chinook Middle School, Clyde Hill Elementary School, and Clyde Hill City Park. For safety, the Clyde Hill City Park will be temporarily closed to through-traffic and recreation use during portions of the work. The length of this closure will depend on the alternative selected.
In some cases, crews may need access to private property to conduct assessments or perform construction activities. Any such access will be coordinated in advance with property owners.
Community Engagement
In the near future, the city will host a virtual open house to discuss the next steps for the project. To ensure broad awareness, details about the open house will be shared through a mailed notice to the community and posted on the project website here.
We want to understand and support the needs of the community to the extent possible, and we are committed to working through construction with residents to minimize impacts.
The city will share more project information and engage with residents as the project continues. Communication with residents and businesses will include a variety of materials, such as work notification postcards, project updates, and flyers for upcoming construction activities. These will be distributed at key project milestones to keep the community informed about any potential impacts.
Next Steps for the Project
Currently, the project is in the Business Case Analysis (BCA) phase, in which alternatives are presented that address the need of the project stated above. When the preferred alternative is selected and approved, the project will move to the preliminary design phase.