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The designs for SR 520 improvements between I-5 and I-405 have undergone many iterations of planning, analysis and stakeholder involvement. This page contains documents that informed the design of the individual projects that make up the SR 520 Bridge Replacement and HOV Program. The documents include community design details, technical analyses, and legislation directing WSDOT to complete these design processes.
This SR 520 "Rest of the West" webpage contains a listing of key design processes specific to SR 520 reconstruction between Lake Washington and I-5.
January 2020 | Summary of 2019 community and stakeholder engagement (pdf 2 mb)
January 2020 | Public comment appendices (pdf 3.2 mb)
October 2019 | NEPA/SEPA Environmental Reevaluation: I-5 Design Refinements (pdf 398 kb)
February 2016 | Final concept design report
August 2015 | Portage Bay Bridge CPTED final report (pdf 19 mb)
Dec. 20, 2012 | Seattle Community Design Process final report (pdf 31 mb)
Final report broken down in sections
Report in 8.5 x 11 letter format
Public comment summaries
Sept. 14, 2012 | SCDP draft design report
Dec. 2011 | SCDP progress update
Seattle Community Design Process - 2011 Progress Update (pdf 1.3 mb)
Public comment summaries
Final report (pdf 4 mb)
ESSB 6392 Workgroup Meeting materials
Dec. 13, 2010 - Seattle City Council presentation materials
Dec. 1, 2010 - ESSB 6392 Workgroup meeting
Sept. 13, 2010 - Seattle City Council presentation materials
Sept. 9, 2010 - ESSB 6392 Workgroup meeting #3 materials
Aug. 19, 2010 - ESSB 6392 Workgroup meeting #2 materials
ESSB 6392 Workgroup meeting #2 materials
Aug. 3, 2010 - Seattle City Council presentation materials
July 22, 2010 - ESSB 6392 Workgroup meeting #1 materials
July 19, 2010
December 2008 | Westside Project Impact Plan (pdf 6.5 mb)