The Willamette Water Supply System Commission’s goal is to provide a stable and seismically resilient water supply for ratepayers in Washington County. The cities of Hillsboro and Beaverton, along with the Tualatin Valley Water District, have come together to build more than 30 miles of large-diameter pipelines, expand the existing raw water facility, and modify an intake on the Willamette River near Wilsonville, a new raw water filtration facility near Sherwood and water reservoirs on Cooper Mountain.

JWF, serving as the trenchless subcontractor, constructed a 270-foot pipe ram of 84-inch-diameter steel pipe underneath Arrowhead Creek, the 55-foot-diameter by 54-foot-deep secant pile launch shaft and 25-foot-diameter by 45-foot-deep secant pile reception shaft, 500 feet of 66-inch welded steel pipe, approximately 1,000 feet of underground utilities, tie-in to the existing pipeline, cleaning and pressure-testing of the pipelines, and other miscellaneous items to complete the pipeline installation. The pipe ram was completed below the water table in cobble- and boulder-laden ground using specialized equipment.

This project is an effort on behalf of the City of Wilsonville and the Willamette Water Supply Program to build improvements in and around the Willamette River Treatment Plant in Wilsonville, OR. The goal of the project is to provide an improved pump station, seismically reinforce the Willamette River bank, increase intake capacity, build a new electrical building and standby power along with a new raw water pipeline.

The scope of work included 270-feet of 84-inch O.D., 1.25-inch thick steel casing pipe ramming, a main utility installation of 270-feet of 66-inch O.D. butt welded pipe, and approximately 50-feet of 66-inch riser pipes and fittings. JWF was responsible for managing the secant shaft installation, excavation, and backfill.


Willamette Water Supply




Tunneling & Trenchless