July 18, 2025 7:23 am

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Toll rates on the SR 99 tunnel set to increase July 1, 2025

Beginning Tuesday, July 1, toll rates for the SR 99 tunnel in Seattle will increase by 3 percent. The Washington State Transportation Commission (WSTC) approved this increase during its May 13 meeting as part of a scheduled rate adjustment plan adopted in 2018.

 SR 99 tunnel
State Route 99 Tunnel. Source: The Hermanson Company

What’s changing:

  • Toll rates will increase by 5 cents during off-peak and morning hours.
  • Toll rates will increase by 10 cents during evening peak hours.
Toll rates increase

Tolling helps repay the cost to build the tunnel, along with operations, and ongoing maintenance. Tolls vary depending on the time of day, with lower rates on nights and weekends. As always, drivers with a Good To Go! account and pass will continue to pay the lowest toll rate on every trip. For more information about the rate-setting process, please visit the Commission’s website.


Source: Washington State Department of Transportation

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