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Plans are to build a water treatment facility along 124th Avenue near Tualatin-Sherwood Road.

COURTESY OF THE WILLAMETTE WATER SUPPLY PROGRAM - This map shows both the proposed pipeline as well as the roadways it will follow in the Sherwood area. Willamette Water Supply Program plans call for the construction of a $250 million water treatment plant along 124th Avenue near Tualatin-Sherwood Road.While the construction of 124th Avenue continues, plans are in the works to soon begin installing pipeline under the roadway as part of the Willamette River Water Supply Program. The ambitious program will eventually draw water from the Willamette River at Wilsonville and pipe it 30 miles to Hillsboro.

"We're anticipating the Southwest 124th pipeline work to begin in the next couple of weeks," said Marlys Mock, media and community relations coordinator for the program.

The Willamette Water Supply Program is a partnership between the Tualatin Valley Water District and the City of Hillsboro.

Projected cost for the entire program is expected to come in at around $1 billion, one of the costliest infrastructure projects ever in the state, according to Mock.

At the same time, plans to construct a water treatment facility along 124th Avenue near Tualatin-Sherwood Road are continuing as well with the plant currently in a preliminary concept design stage.

"Everything is going well to move ahead with property acquisition," Mock said of the treatment plant, which has an early estimated cost of $250 million.

Spreading across approximately 20 acres of land (which includes everything from roads into the plant to all the buildings and infrastructure), the treatment facility will be about four times larger than the Wilsonville treatment plant (where Sherwood's water is currently treated before being distributed to city residents), said Mock.

Preliminary plans call for construction of the treatment facility to begin in 2022 with completion set for 2025.

"The new plant, like the pipelines feeding it and leaving it, will be a robust and resilient piece of infrastructure, designed to withstand major disasters like the Cascadia subduction zone earthquake with minimal plant down time," said Mock. "It will utilize proven treatment procedures to meet or exceed all state and federal drinking water requirements."

Quantifying the minimal time down for the system after the so-called "big one," Mock said the water system could be up and running within a week instead of weeks or months.

Mock said the treatment facility will initially treat 60 million gallons of water per day with planned expansions of approximately 20 million gallons per day over the next 30 years. At build out, the capacity will be at an estimated 100 million gallons per day, she said.

Meanwhile, the Willamette River Water Supply Program is also in the process of working with neighbors in the Cooper Mountain area (off of Grabhorn Road where the roadway takes a sharp left near Stone Creek Drive) for the installation of water storage tanks, with construction to begin in 2022 as well.

Those gravity-feed tanks will send water to the Tualatin Valley Water District and the city of Hillsboro.

In July, the Willamette Water Supply Program met a major milestone: the completion of a mile of pipeline as part of two separate projects at Kinsman Road in Wilsonville and in the South Hillsboro area.

By Ray Pitz
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