Kiewit wins contract to demolish the viaduct

Posted on May 16 2018 1:21 PM

Today, Kiewit Infrastructure West Co. was named the apparent-best-value contractor for the project that will demolish the viaduct, decommission the Battery Street Tunnel and reconnect city surface streets just north of the new SR 99 tunnel.

The project’s design-build contract, which includes both design and construction services, is valued at $93.7 million. Kiewit submitted the apparent-best-value bid – a combination of points received for their technical proposal and their price.

Timelines for the work will emerge after the contract is finalized and the contractor receives approval to begin design work. After that point, WSDOT will be able to share more specifics about how demolition and decommissioning will proceed.

Last year we combined three projects into one in order to save construction time and reduce risk, so this project entails more than just demolishing the Alaskan Way Viaduct. Kiewit will be responsible for:

  • Removing the Alaskan Way Viaduct.
  • Removing the Columbia Street and Seneca Street ramp structures.
  • Decommissioning the Battery Street Tunnel, removing utility and mechanical systems, sealing the entrances and filling the tunnel.
  • Raising Aurora Avenue North to grade between Harrison Street and Denny Way, rebuilding the street, and reconnecting Thomas and John streets across Aurora Avenue North.
  • After viaduct demolition is complete, restoring waterfront roadways, sidewalks, street lighting and other elements to a temporary condition until the City of Seattle builds the new waterfront.

Demolition cannot start until the tunnel opens to drivers, which could be as soon as this fall.

Order: 9.1