Population in the Clark Regional Wastewater District’s (District) service area is growing. The District is starting a third planned improvement to the Discovery Corridor Wastewater Transmission System, the Neil Kimsey Regional Force Main Upgrade Project. The project will increase the capacity of the Neil Kimsey Regional Pump Station. There will be no interruption to your sewer service.

Sign up for email updates as we complete planning. Read on for background and details.

The Discovery Corridor Wastewater Transmission System (DCWTS), which provides service to the City of Ridgefield and the Discovery Corridor, is a multi-phased regional conveyance system that directs wastewater southward to the Salmon Creek Treatment Plant. The existing City of Ridgefield wastewater treatment plant is nearing capacity, and local comprehensive plans call for significant industrial and commercial development in and around Ridgefield. These large employment centers generate significant utility demand and the Salmon Creek Treatment Plant offers reliable wastewater treatment capacity.

Initial construction, Phase 1 of the DCWTS, was completed in 2017, and a second upgrade to the DCWTS (Phase 2) is currently underway. Planning work identified a third upgrade that will increase capacity of the Neil Kimsey Regional Pump Station by extending an existing 22-inch force main roughly 3.25 miles. To avoid conflicts with State and County improvements planned for the NE 179th Street interchange area, this work will be split into two packages: Package A and Package B. Package A includes work in the vicinity of the NE 179th Street interchange and Package B includes the remaining project extents.

Procurement of engineering services will occur in 2025. A Request for Proposals is currently posted on the District procurement portal: https://mrscrosters.bonfirehub.com.

The overall schedule of the project will be as follows.

Construction methods to install the sewer are being developed but will generally use open-cut excavation methods, which consists of digging a trench, laying pipe, and backfilling. Careful planning is taking place to minimize impacts to local businesses and the traveling public. Close coordination with Clark County and Washington State Department of Transportation is ongoing.

Sewer service will be maintained during construction.

Funding for the project will come, in part, from a low-interest Public Works Board Loan. The loan, and balance of project costs, will be funded by system development charge revenue, which is collected from new development.