Tolling the SR 99 Tunnel

Tolling the SR 99 Tunnel

Funding for the $3.2 billion viaduct replacement program comes from state, federal and local sources as well as the Port of Seattle and tolls on drivers using the tunnel. Of that total cost, the 2012 Legislature stated $200 million should come from toll funding. Tolls could also pay for future tunnel operations and maintenance costs, similar to other toll facilities in Washington. Tolling of the SR 99 tunnel is anticipated to begin after the tunnel opens to drivers. 

Setting toll rates

Toll rates for the SR 99 tunnel have not been determined. The Washington State Transportation Commission will oversee the toll rate-setting process in 2018.

Studying toll rates

Over the past few years, various SR 99 tunnel toll scenarios have been studied in reports to the Legislature and the viaduct replacement environmental documents.

WSDOT and the City of Seattle established the 15-member Advisory Committee on Tolling and Traffic Management in fall 2011.

In 2014, the committee made advisory recommendations on strategies for tolling the SR 99 tunnel to raise revenue while minimizing and mitigating traffic diversion onto city streets and I-5. These recommendations were shared with the Governor, Legislature, State Transportation Commission, WSDOT, Seattle Mayor and the Seattle City Council. 

Advisory recommendations for tolling the SR 99 tunnel (pdf 1.1 MB)

Appendices (pdf 1.8 MB)

In summer 2016, WSDOT commissioned an independent traffic analysis firm to conduct a traffic and revenue study that will inform the toll rate setting process. Learn more about the study at WSDOT's Tolling page

Electronic toll collection

Tolls would be collected electronically; there would be no toll booths. For more information about WSDOT’s electronic toll collection system, visit the Good To Go! web page.