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TVWD goes with Tualatin Basin Water Supply Project

BEAVERTON - The Tualatin Valley Water District Board of Commissioners voted last week to confirm its April 2007 presumptive selection of the Tualatin Basin Water Supply Project as the primary source of water to meet water needs for the next 50 years.

Under the arrangement, the district will continue to buy water from the Portland Water Bureau to serve the Metzger area and for backup supply for the district. This decision enables the Tualatin Valley Water District to continue to draw water from the same two sources it has relied on for more than a decade.

The supply project involves expanding the Joint Water Commission's supply source by raising the height of Scoggins Dam at Hagg Lake, constructing a pipeline from the dam to the water treatment plant, and expanding the JWC water treatment plant near Forest Grove.

The project will add 50,000 acre feet of water, which is the amount of water it takes to fill an acre with 1 foot of water, to Scoggins Reservoir per year. The Tualatin Valley Water District would own approximately 23,000 acre-feet.

Currently, the district receives about 45 percent of its water from the JWC supply. The goal is to have this extra source of water online and serving customers by 2016, at which time the district will receive about 90 percent of its water from the JWC supply.

The Tualatin Valley Water District Board of Commissioners approved dedicating the entire $12.5 million budgeted for water supply improvements in its adopted 07-09 biennium Capital Improvement Plan for use on the project. As a result, the district will not make any future capital expenditures to the Willamette River water supply.

In addition to the Tualatin Valley Water District, the project partners include Clean Water Services, the cities of Beaverton, Forest Grove, Hillsboro, Tigard and Tualatin, the Lake Oswego Corporation, the Tualatin Valley Irrigation District and the U.S. Bureau of Reclamation.

Besides providing additional supply for municipal water needs, the project will provide environmental benefits and a stable supply for agricultural uses.