To support the 2026 Regional Transportation Plan, the Puget Sound Regional Council (PSRC) has prepared an addendum to the VISION 2050 Final Supplemental Environmental Impact Statement (SEIS) and is adopting the SEIS as part of the issuance of the addendum pursuant to the provisions of WAC 197-11-630.
The addendum summarizes and analyzes information on the 2026 Regional Transportation Plan, discusses the potential environmental impacts, and identifies differences in impacts from what was identified in the SEIS. PSRC's General Assembly is expected to take final action on the Regional Transportation Plan on May 28, 2026.
Paper copies and other assistance can be requested by contacting PSRC's Information Center at 206-464-7090 or info@psrc.org. Appeals of the adequacy of the addendum must be received in writing by PSRC and postmarked by April 16, 2026. Information on submitting an appeal can be found on PSRC's SEPA Information page.
A memo to PSRC's Executive Board for their December 5, 2024, meeting [PDF/3.2MB] discussed the environmental review to comply with SEPA for the 2026 RTP (see p. 24).