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Project Title & Location
SR 99 - Alaskan Way Viaduct and Seawall Replacement Project
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Project Description
The existing seismically vulnerable Alaskan Way Viaduct and Seawall are both at the end of their useful life and at risk of sudden and catastrophic failure in an earthquake. The cost to replace in-kind this seismically vulnerable structure is between $2.0 and $2.4 billion. (This figure does not include the cost of replacing the seawall or work north of Battery Street tunnel. Necessary to protect public safety and maintain the transportation corridor.
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Contractor/Consultant
PB Americas is the prime design consultant. Hatch Mott MacDonald is the Program Management Assistant Consultant
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Recent Progress
Work has completed to stabilize one critical area of the Viaduct, at Yesler Way. The scope for relocation of electrical lines off of the Viaduct is on Advertisement. Design work has begun for a profile-neutral alternative for the Viaduct Removal from South Holgate to South King Street, and design is underway for Fire-Life-Safety improvements to the Battery Street Tunnel. Work continues with the Collaborative Team to identify Scenarios for the Central Waterfront Viaduct replacement.
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Design Construction Impacts
Design is 60% complete for Fire-Life-Safety improvements to the Battery Street Tunnel. Design continues to progress for other elements. Major Roadway construction is planned to begin Winter 2009.
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Environmental Impacts / Compliance
Program Environmental staff continues to work on the environmental assessment documents for the "Moving Foward" Projects.
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Impacts to Traffic
Utilities construction, currently scheduled to begin Summer 2008, will impact traffic on local city streets. Night and weekend lane closures through the Battery Street Tunnel are likely to begin mid-2009.
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