Project Title & Location

SR 99 - Alaskan Way Viaduct - Seattle Seawall Replacement Project - Environmental impact statement/Right of Way/Design

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.

Contractor/Consultant
Parsons Brinckerhoff Quade & Douglas is the prime design consultant.

Recent Progress
Nickel funding begins July 1, 2003.  Refinements of scope and costs for project alternatives were completed in June 2003.  The selected alternatives are being utilized to complete the Environmental Impact Statement.     For a description of the selected alternatives, please visit the project web site at: http://www.wsdot.wa.gov/projects/Viaduct/

Design Construction Impacts
The recent Cost Estimate Validation Process (CEVP^TM) estimates construction durations between 6 and 11 years, depending on the alternative.  Funding for construction depends upon additional funding from the Regional Transportation Investment District (RTID) as well as other new funding.  For a description of the design alternatives and information on the CEVP process please visit the project web site at: http://www.wsdot.wa.gov/projects/Viaduct/

Environmental Impacts / Compliance
Environmental assessment and documentation is underway and on schedule.   Work remains within scope and budget.

Impacts to Traffic
Not yet fully determined; however, impacts will vary significantly with each alternative.

Planned vs. Actual Expenditures
(Total Project Cost)

Nickel funds included in above costs

2005 Transportation Partnership Account