Preserving our roads & bridges
Learn how we maintain our state's highway system to keep people safe and goods moving 24-hours-a-day, 365-days-a-year.
We oversee the day-to-day needs of maintaining our state's highway system, including:
- 20,679 highway lane miles (includes ramps, collectors and special use lanes).
- More than 3,000 bridges.
- 1,100 traffic signal systems.
- 10 major mountain passes kept open all year.
- Close to 50 safety rest areas.
166,800 electric vehicle
registrations in Washington in 2023, up from 114,600 in 2022.
87 wetland compensation sites
actively monitored on 918 acres in 2023.
25,000 safe animal crossings
in the Snoqualmie Pass East Project area since 2014.