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

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.

The EA compares future effects if WSDOT did or did not build the project and provides a detailed analysis of the proposed project’s effects.

What topics is WSDOT studying in the Environmental Assessment?

  • Transportation
  • Air quality
  • Noise
  • Socioeconomics and environmental justice
  • Geology and soils
  • Visual quality
  • Water resources
  • Ecosystems
  • Hazardous materials
  • Energy and greenhouse gases
  • Historic, cultural, and archaeological resources
  • Parks and recreation lands

What is the schedule for the environmental review?

  • Spring 2019: Scoping period
  • Spring 2019 through spring 2020: Development of Environmental Assessment
  • Spring 2020: Environmental Assessment released for public comment

Key documents

How do I get more information?

If you have questions about the environmental review process or would like to request a briefing for your neighborhood or community group, please contact:

I-405/SR 167 Corridor Communications