Discovery Corridor Wastewater Transmission System Program

Program Overview

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. Initial construction (Phase 1) was completed in 2017, and an upgrade to the 20th Avenue Trunk Sewer was completed in 2023. Recent planning work identified upgrades to three components of DCWTS to accommodate growth in the service area. These are the Pioneer Canyon, Neil Kimsey, and Legacy pump stations, and projects for each are included in the Clark Regional Wastewater District (District) Capital Program. To provide efficient delivery, this work has been split into two packages called DCWTS Phase 2A and 2B. Phase 2A includes work on the pump stations, and Phase 2A adds a second force main serving the Legacy Pump Station.

The existing City of Ridgefield sewer treatment plant is approaching 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 low-cost wastewater treatment capacity to meet those needs.

DCWTS Project Map

When will the project be under construction?
Phase 2A construction is scheduled for 2024 and 2B for 2025.

What’s happening now?
The design of the DCWTS Phase 2A project is on schedule with work proceeding in three areas: final design, environmental permitting, and easement acquisition. The design team is working on data gathering and advancement of a 60% design, which includes upgrades at the Pioneer Canyon, Neil Kimsey, and Legacy pump stations.

Pre-design is underway on DCWTS Phase 2B. Efforts are currently focused on selection of a force main alignment.

Tell me more about the map on this page.
The large aerial overview map includes the approximate alignment of the entire project length north to south from the new Ridgefield service area to the District’s original service area (note areas with darkened background).

  • Phase 1 Work (complete)
    • Pioneer Canyon Force Main and Junction South Gravity Trunk – Ridgefield (Pioneer Canyon Pump Station to S 6th Way) – Completed as part of Phase 1
    • Pioneer Canyon Force Main – I-5 Median (S 6th Way to Carty Road) – Completed as part of Phase 1
    • Pioneer Canyon Force Main – I-5 Median (Carty Road to SR 502, including Southbound Rest Area) – Completed as part of Phase 1
    • Neil Kimsey Regional Force Main – (Northbound Rest Area to NE 10th Ave south of NE 209th St) – Completed as part of Phase 1
    • Neil Kimsey Regional Force Main – NE 10th Ave (NE 199th to NE 179th St) – Completed as part of Phase 1
    • Neil Kimsey Regional Force Main – NE Union Road (NE 179th St to NE 159th St)
  • Phase 2 Work (complete)
    • 20th Avenue Trunk – NE Union Road to NE 20th Ave (NE 159th St to NE 139th St and Legacy Pump Station)
    • Phase 2A Work (design in progress, construction scheduled for 2024)
    • Pioneer Canyon pump station improvements
    • Neil Kimsey Regional pump station improvements
    • Legacy pump station improvements
  • Phase 2B work (design in progress, construction scheduled for 2025)
    • Legacy Force Main – Legacy pump station to discharge at NE Hwy 99 and NE 129th St
  • Phase 3 work (future, construction scheduled for completion in 2029)
    • Neil Kimsey Regional Force Main – Neil Kimsey Regional pump station to 20th Avenue Trunk discharge

How will I be kept informed about this project?
This website will be updated as the project develops.

What if I still have questions?
Please contact Vanessa Johnson, Clark Regional Wastewater District Capital Program Manager at (360) 993-8818 or at vjohnson@crwwd.com.