Sunrise Park Selected as Site of New Water Reservoir

Tigard Public Works is excited to announce a major milestone for the new Reservoir 18 and Pump Station project. After a detailed review, the technical project team has selected Sunrise Park as the best location for reservoir construction.

The new reservoir will ensure enough healthy, safe water to:

• Keep pace with the city’s growth
• Meet peak demand periods
• Navigate emergencies and natural disasters

Comparative Analysis

We considered both Sunrise Park and the Cach Water Site for construction. The city owns both sites and both are at elevations suitable for constructing the reservoir.

The project team conducted a comparative site analysis of the two sites. The analysis looked at several main site selection factors including Permitting and Project Risks, Cost and Constructability, Outside Impacts, and Operations and Resiliency. The team then broke down these main categories further into weighted criteria to compare the two sites.

The team preferred the the Sunrise Park site based on the following key considerations:

• Favorable constructability – for staging area, stockpiling and hauling, and less reservoir foundation work.
• Lower construction cost
• Less constrained site – allowing flexibility of maintenance and future facilities.
• Additional flexibility – relative to sizing a larger reservoir at the site or possibly raising the overflow elevation of the proposed reservoir to reduce earthwork costs.
• Easier permitting process – there are no wetlands at this site
• Reduced construction impacts to the neighborhood – especially heavy truck traffic along portions of Sunrise Lane.

About Sunrise Park

The Sunrise Park property is located on Bull Mountain at the northeast corner of SW 150th Avenue and Sunrise Lane. The City of Tigard purchased the 19.43-acre site in May 2011 with funds from the Parks Bond Program. Three dominant traits of the site include an open meadow surrounded by dense forest, steep slopes, and spectacular views to the north and west. Through a design process and public outreach in 2013, the city decided that the site is best suited to small group activity and passive recreation.

The Water Reservoir project will support an engagement process for Tigard Parks & Recreation to refine specific ways the Reservoir can enhance Sunrise Park. As an added benefit, the Reservoir Project will be able to leave the site in a condition that allow for beneficial future park features. This could include some additional site grading to allow for future trails or viewing areas for the surrounding natural areas.Elizabeth Price Park

Next Steps

In order to meet the City’s stated timeline/schedule for the project, we’ve already begun geotechnical explorations of the reservoir site, including drilling and geophysical surveys. Next, we will do a site survey, arborist evaluation, and initial permitting work to support the design process.