Willamette Water Supply Program partners, City of Hillsboro and Tualatin Valley Water District (TVWD), are teaming up with Washington County to construct nearly 2.7 miles of a large-diameter drinking water transmission pipeline in conjunction with the County’s 124th Avenue Extension road project. This is the first section of the more than 30-mile water transmission pipeline to be built as part of the Willamette Water Supply Program.

The water transmission pipeline project will start at SW Tualatin-Sherwood Road and continue south, then continue east along SW Tonquin Road, then continue south on SW Grahams Ferry Road, ending near SW Day Road. The road project includes extending 124th Avenue south from Tualatin-Sherwood Road across Tonquin Road, then continuing east to Grahams Ferry Road. Road improvements will also be made to sections of Tonquin Road and Grahams Ferry Road.

The Willamette Water Supply Program will fund the pipeline construction and a proportionate share of other project costs. The County’s Major Streets Transportation Improvement Program (MSTIP) will fund road construction work. Construction for this collaborative pipeline and roadway project is scheduled to begin fall 2015 with completion anticipated to occur by the end of 2017.

This interagency collaboration will minimize traffic and construction impacts and save both agencies money by reducing construction and project management costs. The Willamette Water Supply Program and Washington County continue to work together to identify future collaboration opportunities for additional sections of the water transmission pipeline.

Willamette Water Supply Program Background

The Willamette Water Supply Program is a partnership between TVWD and the City of Hillsboro to develop an additional source of drinking water from the mid-Willamette River at Wilsonville. The water transmission pipeline project is currently in the planning and design stages and is anticipated to be built by 2026. The pipeline project will include an expanded Willamette River Water Treatment Plant, water storage tanks, and more than 30 miles of pipelines installed from Wilsonville to Beaverton and Hillsboro. For more information about the Willamette Water Supply Program, visit www.OurReliableWater.org or call 503-848-3000.

124th Avenue, Tonquin Road and Grahams Ferry Road Improvement Background

For more information about the 124th Avenue Extension Project, visit http://124thproject.com or call 503-846-7800.