Alaskan Way Tunnel

Location Seattle, WA

Client Washington State Department of Transportation (WSDOT)

Services Estimating & Cost Management, Program Management, Project Management

Project Value $3.3 billion

Hill is providing the Washington State Department of Transportation (WSDOT) with project management and staffing services for the Alaskan Way Tunnel. The project entails the construction of a two mile bored tunnel through downtown Seattle with supporting above-ground projects at each end of the new tunnel. Following the opening of the tunnel to traffic in 2019, the existing double-decker viaduct was demolished to allow for redevelopment of the downtown central waterfront.

Major elements of the program include a two mile long tunnel beneath downtown Seattle, the largest diameter single-bore tunnel ever completed; a one mile stretch of new highway connecting to the south entrance of the tunnel, near Seattle’s stadiums; a new overpass at the south end of downtown to allow traffic to bypass train blockages near Seattle’s busiest port terminal; demolition of the viaduct’s downtown waterfront section; reconfiguration and reconstruction of several downtown roadways to accommodate the south and north tunnel portals; and a new Alaskan Way surface street along the waterfront that connects SR 99 to downtown.

The scope of work involves bored tunnel, roadway, and major structural and underground components—all executed in a busy urban setting with multiple stakeholders. The program has used both design-build and design-bid-build delivery methods.

Hill’s team has provided critical information governance (IG), document control, and discovery/litigation services to support the program. Hill has played a large role in creating and implementing document control policies and procedures, including advisory and support services related to IG policy and procedure development and implementation. In addition, Hill implemented OpenText Content Server 16 and Primavera Contract Manager to manage the WSDOT projects, training all new employees on documentation procedures and software applications, and communicating weekly reports to the program manager. The reports encompass trends, areas for improvement, and all backlog activity.