As directed by the Legislature, tolling on the SR 99 tunnel is expected to raise revenues to fund $200 million of construction costs, and to fund on-going operations and maintenance. Tolling also helps manage congestion on the SR 99 corridor, particularly with tolls varying by time of day.
When toll rates were initially set on the SR 99 tunnel in 2018, the Commission included a plan for 3% toll rate increases to take effect every three years, subject to review and possible adjustment by the Commission (WAC 468-270-073 & WAC 468-270-040). The purpose of these planned toll rate increases is to manage ongoing cost inflation and ensure the facility generated the necessary revenue to meet legal requirements. The most recent of these 3% toll rate increases took effect on July 1, 2025, and the next is expected to take effect in July 2028.
Current SR 99 Tunnel Toll Rate Schedule
Below are the current toll rates for the SR 99 tunnel, which took effect July 1, 2025. All rates in the table below are for two axle vehicles. Rates increase per each additional axle, which can be found in WAC 468-270-073.
| Toll Rate Hours | Good to Go! Pass | Pay By Mail | Pay By Plate |
|---|---|---|---|
| Midnight – 6am | $1.25 | $3.25 | $1.50 |
| 6am – 7am | $1.55 | $3.55 | $1.80 |
| 7am – 9am | $1.85 | $3.85 | $2.10 |
| 9am – 3pm | $1.55 | $3.55 | $1.80 |
| 3pm – 6pm | $2.80 | $4.80 | $3.05 |
| 6pm – 11pm | $1.55 | $3.55 | $1.80 |
| 11pm – Midnight | $1.25 | $3.25 | $1.50 |
| Weekends | $1.25 | $3.25 | $1.50 |
Public buses, vanpools, emergency responder vehicles, highway maintenance vehicles, school buses, and qualified private buses are exempt from tolls in the tunnel, as identified in WAC 468-270-085.
Footnotes:
- The rates for electronic tolls have been rounded to the nearest five cents, as needed.
- For this payment method, the customer is charged the Good To Go! Pass toll plus a $0.25 fee as provided in WAC 468-270-300.
- The weekend rates will be assessed on the days on which holidays are observed:
New Year’s Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day and Christmas Day.