The Alaskan Way Viaduct Replacement Program is a partnership between the following public agencies:
The Federal Highway Administration (FHWA) is responsible for ensuring that the viaduct replacement projects meet federal regulations.
The Washington State Department of Transportation (WSDOT) owns SR 99 and the viaduct. The agency is responsible for highway inspections and major maintenance, and for ensuring that state regulations are followed.
King County is responsible for implementing transit changes and improvements associated with the program.
The Port of Seattle relies heavily on the SR 99 corridor and has committed $300 million in funding to the program.
The City of Seattle is responsible for viaduct traffic operations and minor maintenance. In addition, the city owns and maintains Alaskan Way, the area underneath the viaduct and many of the utilities located in the project area.