Scholls Area Pipeline Project

The Scholls Ferry Road Pipeline Project is a 7.0-mile section of the overall 30+ mile Willamette Water Supply System pipeline. The Willamette Water Supply Program team is coordinating with public and private road improvement projects in the Roy Rogers, Scholls Ferry and Tile Flat Road areas to install the new water pipeline. Partnering on these road projects reduces community and neighborhood impacts by eliminating the need for multiple construction projects.

This section of pipeline is being designed and constructed in three phases:

  1. The pipeline north of Beef Bend Road to Scholls Ferry Road (PLM 5.1) is a partnership with Washington County’s Roy Rogers Road widening project. Visit Washington County’s website for information about road improvements. Road construction began in 2018. Pipeline construction began in spring 2020.
  2. Construction of the pipeline from Scholls Ferry Road to Grabhorn Road (PLM 5.2) is being coordinated with new residential development along Scholls Ferry and Tile Flat Roads. Construction began in 2019 and is scheduled to be complete in the fall of 2020. Construction updates are posted on this page.
  3. Design of the third phase, Grabhorn Road to Rosedale Road (PLM 5.3), is underway. After an extensive study, the specific alignment of PLM 5.3 was refined. Analysis of the preliminary design alignment along Clark Hill and Farmington roads identified significant seismic risks. The updated alignment was selected after several alternative alignments were analyzed for seismic stability, environmental and community impacts, construction feasibility, and partnership opportunities. This section of the pipeline will travel north along Grabhorn Road to the new water storage tanks on Cooper Mountain, and then west on private property until it reaches the existing Bonneville Power Administration (BPA) corridor. The alignment then moves north following the BPA corridor until Farmington Road. North of Farmington Road, the alignment is within a potential future road corridor through private property.



The public hearing for Washington County’s land use approval of the project is scheduled for February 18. Meeting information can be found on the County’s public hearings page. This public hearing is for the review and approval of the Special Use, Development Review, and Drainage Hazard Area alterations needed for installation of pipeline.


Staff gave updates of WWSP program to CPO 6 and CPO 10 recently. The presentation included design and construction details for the PLM_5.3 segment. The CPO 10 presentation can be found here.


As part of Washington County’s Roy Rogers Road widening project, the drinking water pipeline is being installed along the west side of Roy Rogers Road between Scholls Ferry and Beef Bend Roads. As of mid-February, the pipeline will be completely installed. Next steps include vault work and cathodic protection for the pipeline. The overall project focus will then shift to the road improvements, anticipated to be complete in fall 2021.

Our Reliable Water

Program Timeline

Developing the new Willamette water source will take over a decade.

Willamette Water Supply Program

Willamette Water Supply Program