Cornelius Pass Road Pipeline Project

The Cornelius Pass Road Pipeline Project (PLW_2.0) is a 3.3-mile section of pipeline between Frances Street and the Tualatin Valley Water District connection point just south of Highway 26. About 900 feet of this section of the pipeline will cross the northeast corner of Orenco Woods Nature Park (OWNP). Water pipeline construction is anticipated to begin in late 2021 and continue through late 2024.

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City of Hillsboro Pipeline Project

A City of Hillsboro pipeline project (COH_1.0) is being designed and built concurrently with the Willamette Water Supply Program’s Cornelius Pass Road Pipeline Project (PLW_2.0). Designing and constructing the projects together provides an opportunity to reduce traffic impacts by eliminating a separate construction project and lower the costs of building these projects separately.

Hillsboro’s pipeline project is a planned capital improvement project that includes 2,000 feet of 12-inch ductile iron pipeline. Currently, the area is served by two pipelines that do not connect. The new pipeline will connect these “dead-end” pipes creating a looped system. Loop systems are easier to repair and provide steady water pressure, improving water quality and reliability to customers.

Old Rail Corridor Section


Old Rail Corridor Public Meeting May 26, 2020

Our Reliable Water

Program Timeline

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

Willamette Water Supply Program

Willamette Water Supply Program