Proposed SR 99 Bored Tunnel Underground Simulation March 2010





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Uploaded on Mar 16, 2010

The Washington State Department of Transportation, in partnership with the Federal Highway Administration, King County, the City of Seattle and the Port of Seattle, is leading a program to replace the Alaskan Way Viaduct section of State Route 99, which runs along Seattles downtown waterfront.

For the viaduct section between S. King Street and the Battery Street Tunnel, there is an ongoing environmental process that is reviewing three alternatives previous cut-and-cover tunnel and elevated structure alternatives and a bored tunnel alternative recommended in January 2009. This simulation shows the bored tunnels proposed route beneath downtown Seattle and its proximity to other underground structures.

A second Supplemental Draft Environmental Impact Statement for this project will be published in fall 2010. More information regarding the Alaskan Way Viaduct replacement is available at http://www.alaskanwayviaduct.org

The proposed SR 99 bored tunnel is being designed to withstand an earthquake that only happens every 2,500 years on average (in the range of a 9.0 on the Richter scale) without collapsing. We have information on our website http://www.wsdot.wa.gov/Projects/Viad... describing how tunnel construction would affect properties along the bored tunnel's proposed route.


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