Tolling the SR 99 Tunnel
The SR 99 tunnel will have a toll in both directions. Tolls will be collected via cameras; there will be no toll booths. The tunnel will not be tolled when it first opens, but tolling could begin as early as summer 2019. The exact start date has not yet been determined.
Toll rates will range from $1 to $2.25 for drivers with a Good To Go! pass, depending on time of day. Drivers without a Good To Go! account will pay an extra $2 per toll. Toll rates will also be higher for vehicles with more than two axles. The toll rates were set by the Washington State Transportation Commission in October 2018 after a five-month-long public input process.
Funding for the $3.3 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. The 2012 Legislature directed WSDOT to collect tolls in the SR 99 tunnel in order to repay $200 million in construction bonds borrowed to build the tunnel. Tolls will also pay for ongoing tunnel operations and maintenance costs, including tunnel safety systems, similar to other toll roads in Washington.
WSDOT's tolling webpage has additional background information about the SR 99 tunnel's tolling system.