The Battery Street Tunnel was constructed in the 1950s and is at the end of its useful life. WSDOT’s final environmental document for the program included decommissioning (filling and sealing) the tunnel, and so WSDOT has a legal obligation to implement that plan.
Community ideas have been proposed for alternative uses for the tunnel. However, given the age and condition of the structure, it would need significant and costly structural and system upgrades in order to be safe for other uses. WSDOT will be decommissioning the tunnel as part of a design-build contract that also includes demolishing the viaduct and connecting surface streets at the tunnel’s north portal.