Brightwater Tunnel Boring Machine - TBM
Brightwater TREATMENT SYSTEM   -   King and Snohomish Counties, Washington

"Modern tunneling technology enabled complete construction while causing minimal disruption to residents and businesses above ground.

“Luminita” was launched Oct 1, 2007 from the North Creek Portal and will dig east to the Brightwater treatment plant site at the intersection of State Routes 9 and 522, where it is expected to be retrieved in November 2008.. View : VIDEO

“Rainier” launched in December 2007 from the North Kenmore Portal and will tunnel west toward the Ballinger Portal, where it is expected to be retrieved in November 2009.

A Tunnel Boring Machine "Helene" emerged on the Brightwater treatment plant site north of Woodinville on Friday afternoon, November 14, 2008, completing its 14-month underground journey from Bothell that began in September 2007. The concrete-lined tunnel is 14,000 feet long and approximately 18 feet in diameter. The tunnel lies about 260 feet below the surface at its deepest point.


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