Brightwater TREATMENT SYSTEM - King and Snohomish Counties, Washington
| "Modern tunneling technology enabled complete construction while causing minimal disruption to residents and businesses above ground. | |
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“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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