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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
Parsons Brinckerhoff Quade & Douglas is the prime design consultant. Hatch Mott MacDonald is the Program Management Assistant Consultant
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Recent Progress
During the current quarter, work on the supplemental draft EIS is 90% complete, including revisions to the north Aurora design concept and construction traffic analysis. Design work continues on the tunnel and rebuild alternatives. Based on TPA funding, the project is building an organization on a blended team consisting of WSDOT, City of Seattle, and consultant staff.
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Design Construction Impacts
Utilities construction is currently scheduled to begin Summer-2008, which will impact traffic on local city streets. Roadway construction is planned to begin Winter-2009. Ramp and lane closures on SR 99 are likely to begin mid to late 2010.
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Environmental Impacts / Compliance
The environmental team is finishing work on the supplemental draft EIS, and has continued to address comments received during the draft EIS comment period. Work has begun on developing a mitigation strategy for the final EIS.
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Impacts to Traffic
The team continues to analyze the trade offs between construction duration, cost, and maintenance of traffic, and impact to the community.
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