SR 520 Bridge Replacement and HOV Program - Technical documents and legislation

This page contains technical and legislative reports, as well as legislation related to the SR 520 corridor. The documents are listed in reverse chronological order (newest first) by type.

Environmental reports , such as Environmental Impact Statements and many draft design reports, can be found in the Environmental Documents section of the Resource Library.

Transportation reports

SR 520 Transit Station Usage Study

Finance reports

Washington Office of State Treasurer's Report on SR 520 Bridge Replacement and HOV Project Funding Alternatives

Miscellaneous design and other reports

SR 520 West Side Final Concept Design Report and Public Comment Summary

Read the final report, including Chapters 1-7, here:

Proposal K - Tunnels at East Montlake and the Arboretum

Conceptual Design and Cost Estimate

Corridor Aesthetics Handbook: Ideas for Urban Corridor Design - August 2006

I-5 to Floating Bridge Tunnel Concept Review - April 2006

Catastrophic Failure Plan

Community Construction Management Plans

Legislation related to the SR 520 corridor