• About Us
  • Our Capabilities / Our Projects
  • People & Careers
  • News & Publications
  • Contact Us

Project Portfolio

Search Filters
  Find Reset
Project List
 1-10 Next >> Results per page: 10 | 25 | 50 | 100 | All    Total: 533
 Project NameClient NameWSP|PB Capabilities
 1-10 Next >> Results per page: 10 | 25 | 50 | 100 | All    Total: 533
115-kV Transmission Line 115-kV Transmission Line
Siem Reap, Cambodia
Asian Development Bank and Cambodia Power Transmission LinesPower/Energy, Transmission & Distribution
131 Clarendon St., Boston 131 Clarendon St., Boston
Boston, Massachusetts, United States
Torrey Architecture, Inc.Building Engineering, Lighting Design
14th Street Corridor - The Ambassador 14th Street Corridor - The Ambassador
Denver, Colorado, United States
City and County of Denver, Downtown Denver PartnershipVisualization, Design Visualization
50 Connaught Road Central 50 Connaught Road Central
Hong Kong
Apollo Global Real EstateProgram Management/Construction Management
63rd Street Connector 63rd Street Connector
Queens, New York, United States
Metropolitan Transportation Authority - New York City TransitRail, Tunneling & Geotechnical
796 Huai Hai Road Restoration 796 Huai Hai Road Restoration
Shanghai, China
Richemont GroupBuilding Engineering, Commercial & Retail
AC Transit State of Good Repair AC Transit State of Good Repair
California, United States
Alameda-Contra Costa TransitStrategic Consulting, Asset Management Strategy
Active Traffic Management Feasibility Studies Active Traffic Management Feasibility Studies
Seattle, Washington, United States
Washington State Department of TransportationIntelligent Transportation Systems
Africa House Africa House
Holborn, UK
Daejan Investments (Grove Hall) LimitedBuilding Engineering, Commercial & Retail
African Burial Ground Memorial African Burial Ground Memorial
New York, New York, United States
General Services Administration Government

Alaskan Way Viaduct and Seawall Replacement

Seattle, Washington, United States

Client: Washington State Department of Transportation

WSP | Parsons Brinckerhoff Role: General Engineering Consultant, Project Visualization (3D Modeling, Interactive Application Development, Virtual Design & Construction)

Alaskan Way Viaduct and Seawall Replacement


As general engineering consultant, Parsons Brinckerhoff served for 10 years as lead strategic advisor assisting the Washington State Department of Transportation (WSDOT) in eliminating its greatest public safety risk—the seismically vulnerable viaduct running along the Seattle waterfront. The project included preparation of an environmental impact statement and bid documents in connection with replacing the viaduct, which runs more than 2 miles (3.2 kilometers) and carries 110,000 vehicles daily. In addition, conceptual design was prepared for replacement of the 6,500-foot-long (1,980-meter) Elliott Bay Seawall.
The $3.1 billion replacement program includes approximately 1 mile (1.6 kilometers) of new elevated roadway in the south end connecting to a bored 56-foot-diameter (17-meter) tunnel approximately 2 miles long (3.2 kilometers) with a stacked interior roadway beneath the downtown. The Parsons Brinckerhoff team developed the design-build technical requirements and specifications for the tunnel, the largest ever constructed by tunnel boring machine technology.
The team also led a rigorously inclusive public involvement program to help define and communicate project goals and develop political consensus. Project visualization proved to be an invaluable tool to inform the public and as a design tool to determine the viability of proposed concepts. Parsons Brinckerhoff drew upon CAD and geospatial data to develop digital 3D and Building Information Models for all of the major parts, pieces and processes of the project.
Tunnel construction began in late 2011 under a design-build contract. Completion is scheduled for late 2015.