SR 522 SR 527

WSDOT is currently completing environmental review, including permitting and an Environmental Assessment (EA), for the I-405, SR 522 Vicinity to SR 527 Express Toll Lanes Improvement Project.

What is an Environmental Assessment?

In compliance with the National Environmental Policy Act (NEPA), the Environmental Assessment describes the purpose and need of the project and provides information to the public and decision makers about environmental effects and benefits of the project.

I-405 - SR 522 Vicinity to SR 527 Express Toll Lanes Improvement Project

Project news

  • Preliminary engineering is currently underway, funded in part with express toll lane revenue.

Overview

I-405 is one of the most congested corridors in the state, serving an area that is exceeding regional population growth estimates.