This Environmental Assessment covers a previous version of the I-405 Renton to Bellevue Project with a different scope.

In 2018, WSDOT published updated environmental documentation for the currently funded I-405 Renton to Bellevue Widening and Express Toll Lanes project. 

I-405, SR 169 to I-90 - Renton to Bellevue Project Environmental Assessment

WSDOT published the Finding of No Significant Impact (FONSI) for the Renton to Bellevue Project on November 20, 2008.

• Renton to Bellevue FONSI (pdf 3.6 mb)
• Chapters 1 - 3 (pdf 1.72 mb)
• Chapter 4 (pdf 4.57 mb)
• Chapter 5 (pdf 5.88 mb)
• Chapters 6 - 8 (pdf 1.11 mb)
• Appendix A:  Project Design Features (pdf 4.79 mb)
• Appendix B:  Glossary (pdf 40 kb)
• Appendix C:  Proposed Construction (pdf 43 kb)
• Appendix D:  NEPA Elements (pdf 37 kb)
• Appendix E:  Concurrence Letters (pdf 5.34 mb)
• Appendix F:  Commitments (pdf 109 kb)

Discipline Reports, I-405 Renton to Bellevue Project, SR 169 - I-90
The Discipline Reports are available at local libraries or you may purchase a CD with all 21 reports by contacting the I-405 Corridor Program Office, 425-456-8585.