Westside Reservoir

This project constructs a 3 million gallon storage reservoir near the intersection of SW Tooze Road and SW Baker Road, and installs about 3,000 linear feet of new 24-inch water transmission line on SW Tooze Road, extending from the reservoir to the intersection at SW Grahams Ferry Road.

Photo from Apr. 2025

Tooze Road Paving Updates 

The City is planning to repave portions of  SW Tooze Road impacted by the new water transmission main installation between the intersection with SW Westfall Road and the new reservoir site at 12771 SW Tooze Road. Paving will take roughly two (2)  weeks to complete. Portions of one (1)  lane will be closed for the duration of the work. The current plan is to perform this work with a 24/7 flagging operation, though actual paving will be limited to daytime work hours. The flagging will move with the paving crew as paving progresses along SW Tooze Road. The tentative start date is May 15, 2025, subject to change. Please check this project website for additional updates as they become available..

Project Overview

The City of Wilsonville is constructing a new seismically resilient reservoir and transmission line to increase overall water storage capacity to support growth and provide an additional water supply in the event of an emergency. The project supplements four existing water storage tanks currently in operation.

The reservoir is being constructed on City-owned property on SW Tooze Road in unincorporated Clackamas County.  The water transmission line connects the new reservoir to the community’s existing water system.

• New 3-million-gallon water storage reservoir
• Built to modern seismic and operational standards
• Stormwater management
• Associate electrical and communications
• Access driveway
• Landscaping and screening
• 3,000 linear feet of 24-inch water transmission line

For additional information, see our FAQ. 

Key Benefits

• Increases water storage and delivery capacity to support growth
• Provides additional water for everyday use and emergencies
• Provides seismic resilience in the event of an earthquake
• Reduces time and cost to build by using existing City-owned site
• Offers space for future water system improvements 

Project Area

The City-owned property is in unincorporated Washington County on Tooze Rd.

Schedule

This project is in information gathering stages, and subject to change as data is gathered. The preliminary schedule milestones for the sequence of project phases:

• Spring/Summer 2023 – Preliminary Analysis, Investigations and Design
  • Preliminary Design - July
• Winter 2024 – Permitting
• Spring 2024 – Design Completed
• Summer 2024 – Land Use Permitting
• Summer 2024 – Construction Begins
• Summer 2025 – Construction Completed