SR 99 tunnel tolls increasing July 1: Here鈥檚 how much more you鈥檒l pay
Jun 16, 2025, 10:23 AM | Updated: 1:06 pm
Toll signs above the SR 99 tunnel exit. (Photo courtesy of WSDOT)
(Photo courtesy of WSDOT)
The Washington State Transportation Commission (WSTC) is increasing the toll rates on the State Route 99 (SR 99) tunnel in Seattle by 3%.
The new rates will take effect on Tuesday, July 1 after commissioners approved the increase during their regular monthly meeting last week.
Toll rates will increase by 5 cents during off-peak and morning hours, and by 10 cents during evening peak hours. The increased revenue is intended for construction debt, operations, and ongoing maintenance on the SR 99 tunnel.
A chart showing the new toll rates that will go into effect July 1
Toll rates vary throughout the day to help manage congestion on the SR 99 corridor, according to WSTC.
This toll increase is nothing out of the ordinary, as WSTC developed a plan where toll rates increase by 3% every three years to keep pace with financial and operational needs. Tolls were last increased on the SR 99 tunnel on July 1, 2022.
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