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SR 520 - I-5 to Medina Environmental Documents

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SR 520 is a critical component of the regional infrastructure, connecting Seattle to communities on the Eastside. The SR 520, I-5 to Medina: Bridge Replacement and HOV Project includes several safety, mobility and environmental improvements to help create safer and more reliable commutes while minimizing impacts to local neighborhoods and communities.

October 2016 - NEPA/SEPA environmental reevaluation: West Approach Bridge South and Montlake lid design refinements (pdf 3mb)

August 2016 - Draft Traffic Noise Model Analysis for Montlake Lid (pdf 2.5 mb)

January 2014
- SR 520 Floating Bridge and Landings Project Annual Sustainability Data Report (pdf 5.7mb)

March 2013
- SR 520, I-5 to Medina: Bridge Replacement and HOV Project Final Construction Noise and Vibration Report (pdf 6.9mb)

December 2011 - SR 520, I-5 to Medina: Bridge Replacement and HOV Project Final Aquatic Mitigation Report (revised February 2012)

Part 1 (pdf 9.0mb)

Part 2 (pdf 8.9mb)

Part 3 (pdf 14.8 mb)

Part 4 (pdf 9.7 mb)

December 2011 - SR 520, I-5 to Medina: Bridge Replacement and HOV Project Final Wetland Mitigation Report (revised February 2012)

Part 1 (pdf 4.0mb)

Part 2 (pdf 3.4mb)

Part 3 (pdf 5.9mb)

August 2011 - SR 520, I-5 to Medina: Bridge Replacement and HOV Project Draft Aquatic Mitigation Report (pdf 15.74mb)

August 2011 - SR 520, I-5 to Medina: Bridge Replacement and HOV Project Draft Wetland Mitigation Report (pdf 11.43mb)

August 2011 - SR 520, I-5 to Medina: Bridge Replacement and HOV Project Geomorphology and Shoreline History of Lake Washington, Union Bay, and Portage Bay Technical Memorandum

Part 1 (7.3mb)

Part 2 (9.4mb)

August 2011 - Record of Decision (pdf 4.99mb)

The Federal Highway Administration has signed the Record of Decision, a document that finalizes the NEPA environmental process and allows WSDOT to further design for the I-5 to Medina: Bridge Replacement and HOV Project and obtain construction permits.

The Record of Decision also lists many commitments made by WSDOT and FHWA to surrounding communities before, during and after project construction. These commitments include mitigation for project effects to the environment and neighborhoods as well as implementing traffic-calming measures in the Arboretum and developing a community construction management plan.

Attachments

Attachment 1 - Section 106 Programmatic Agreement (pdf 2.39mb)

Attachment 2 - FEIS Comments (pdf 58mb)

Attachment 3 - Technical Memoranda Supporting the Responses to
Comments on the Final EIS
(pdf 1.51mb)

Attachment 4 - Correspondence (pdf 1.60mb)

June 2011 - Final Environmental Impact Statement (EIS)

The final EIS compares the Preferred Alternative with the design options analyzed in the supplemental draft EIS, further refines previous analyses based on the Preferred Alternative design, and identifies how WSDOT will avoid, minimize and mitigate for project effects. The document also takes into account the latest assumptions about other regional transportation and development projects to place the project within a wider context.

In the final EIS, we respond to comments from agencies, tribes, jurisdictions and the public.

To request a free copy of the executive summary (which includes a DVD of the complete final EIS and discipline reports) or to purchase a printed copy of the document for $60 (which does not exceed cost of production):
- Call 206-770-3500
- Email sr520bridge@wsdot.wa.gov

Final EIS - Executive Summary (6.85mb)

Cover, Front Matter, and Table of Contents (pdf 2.58 mb)

Chapter 1 - Introduction to the Project (pdf 1.61 mb)

Chapter 2 - Alternatives

Part 1 (pdf 1.74 mb)
Part 2 (pdf 10.21 mb)

Chapter 3 - Construction Activities

Part 1 (pdf 2.45 mb)

Part 2 (pdf 6.79 mb)

Chapter 4 - The Project Area's Environments

Part 1 (pdf 6.21 mb)

Part 2 (pdf 5.01 mb)

Chapter 5 - Project Operation and Permanent Effects

Part 1 (pdf 8.38 mb)

Part 2 (pdf 3.04 mb)

Part 3 (pdf 11.69 mb)

Part 4 (pdf 4.54 mb)

Part 5 (pdf 4.03 mb)

Chapter 6 - Effects During Construction of the Project (pdf 7.51 mb)

Chapter 7 - Cumulative Effects (pdf 2.90 mb)

Chapter 8 - Other Considerations (pdf 189 kb)

Chapter 9 - Final Section 4(f) Evaluation

Part 1 (pdf 2.46 mb)

Part 2 (pdf 6.80 mb)

Chapter 10 - Section 6(f) Summary (pdf 7.17 mb)

Chapter 11 - Public and Agency Comments (pdf 298 kb)

Attachments

Attachment 1 - Acronyms and Abbreviations (pdf 97 kb)

Attachment 2 - Index (pdf 197 kb)

Attachment 3 - List of Preparers (pdf 92 kb)

Attachment 4 - Distribution List (pdf 49 kb)

Attachment 5 - References (pdf 208 kb)

Attachment 6 - Federal Register Notices (pdf 296 kb)

Attachment 7 - Discipline Reports

Agency Coordination and Public Involvement Discipline Report Addendum (pdf 1.32 mb)

Air Quality Discipline Report Addendum (pdf 2.38 mb)

Construction Techniques and Activities Discipline Report Addendum (pdf 4.54 mb)

Final Cultural Resources Assessment and Discipline Report

Part 1 (pdf 3.98 mb)
Part 2 (pdf 17.07 mb)
Part 3 (pdf 14.16 mb)

Cultural Resources Attachments

Attachment 1 (pdf 3.98 mb)

Attachment 2

Part 1 (pdf 17.07 mb)
Part 2 (pdf 14.16 mb)

Attachment 3

Part 1 (pdf 17.07 mb)
Part 2 (pdf 14.16 mb)
Part 3 (pdf 17.07 mb)
Part 4 (pdf 14.16 mb)
Part 5 (pdf 3.98 mb)
Part 6 (pdf 17.07 mb)

Attachment 4A

Part 1 (pdf 17.07 mb)
Part 2 (pdf 14.16 mb)
Part 3 (pdf 17.07 mb)

Attachment 4B

Part 1 (pdf 17.07 mb)
Part 2 (pdf 14.16 mb)
Part 3 (pdf 17.07 mb)
Part 4 (pdf 14.16 mb)
Part 5 (pdf 3.98 mb)
Part 6 (pdf 17.07 mb)

Attachment 4C (pdf 2.65 mb)

Description of Alternatives Discipline Report Addendum (pdf 3.92 mb)

Ecosystems Discipline Report Addendum (pdf 8.36 mb)

Energy Discipline Report Addendum (pdf 1.83 mb)

Environmental Justice Discipline Report Addendum (pdf 1.47 mb)

Geology and Soils Discipline Report Addendum (pdf 953 b)

Hazardous Materials Discipline Report Addendum (pdf 865 kb)

Final Indirect and Cumulative Effects Analysis Discipline Report (pdf 4.52 mb)

Land Use, Economics, and Relocations Discipline Report Addendum (pdf 2.14 mb)

Navigable Waterways Discipline Report Addendum (pdf 768 kb)

Noise Discipline Report Addendum (pdf 13.61 mb)

Recreation Discipline Report Addendum (pdf 3.39 mb)

Social Elements Discipline Report Addendum (pdf 3.46 mb)

Final Transportation Discipline Report

Part 1 (pdf 12.76 mb)
Part 2 (pdf 10.81 mb)
Part 3 (pdf 8.91 mb)

Visual Quality and Aesthetics Discipline Report Addendum

Part 1 (pdf 11.76 mb)
Part 2 (pdf 9.72 mb)

Water Resources Discipline Report Addendum (pdf 3.63 mb)

Attachment 8 - Correspondence

Part 1 (pdf 8.09 mb)
Part 2 (pdf 14.17 mb)

Attachment 9 - Mitigation Plans

Conceptual Wetlands Mitigation Plan (pdf 8.14 mb)

Conceptual Aquatic Mitigation Plan

Part 1 (pdf 9.70 mb)
Part 2 (pdf 17.46 mb)

Arboretum Mitigation Plan (pdf 1.82 mb)
Section 106 Programmatic Agreement (pdf 2.40 mb)
Community Construction Management Plan Outline (pdf 177 kb)
ABGC Memorandum of Understanding (pdf 1.37 mb)

Attachment 10 - 2010 Supplemental Draft EIS

Attachment 11 - Responses to 2010 SDEIS Comments

Business (pdf 3.99 mb)

Form letters (pdf 7.16 mb)

Regulatory Agencies (pdf 8.71 mb)

Tribal (pdf 17.94 mb)

Community Organizations

Part 1 (pdf 17.89 mb)

Part 2 (pdf 18.62 mb)

Part 3 (pdf 16.24 mb)

Part 4 (pdf 27.96 mb)

Part 5 (pdf 31.27 mb)

Part 6 (pdf 36.89 mb)

Part 7 (pdf 9.15 mb)

Part 8 (pdf 33.26 mb)

Part 9 (pdf 24.24 mb)

Part 10 (pdf 8.99 mb)

Part 11 (pdf 20.2 mb)

Part 12 (pdf 19.97 mb)

Part 13 (pdf 20.6 mb)

Part 14 (pdf 16.38 mb)

Part 15 (pdf 16.09 mb)

Part 16 (pdf 13.68 mb)

Federal Agencies

Part 1 (pdf 9.03 mb)
Part 2 (pdf 11.49 mb)

Individuals

Part 1 (pdf 15.11 mb)

Part 2 (pdf 18.16 mb)

Part 3 (pdf 22.79 mb)

Part 4 (pdf 11.93 mb)

Part 5 (pdf 23.94 mb)

Part 6 (pdf 3.25 mb)

Part 7 (pdf 17.13 mb)

Part 8 (pdf 15.18 mb)

Part 9 (pdf 19.02 mb)

Part 10 (pdf 21.1 mb)

Part 11 (pdf 16.9 mb)

Part 12 (pdf 21.5 mb)

Part 13 (pdf 25.7 mb)

Part 14 (pdf 18.9 mb)

Part 15 (pdf 23.6 mb)

Part 16 (pdf 20.8 mb)

Part 17 (pdf 42.8 mb)

Part 18 (pdf 15.6 mb)

Part 19 (pdf 19.8 mb)

Local Agencies

Part 1 (pdf 16.21 mb)
Part 2 (pdf 39.53 mb)
Part 3 (pdf 6.44 mb)

State Agencies

Part 1 (pdf 26.62 mb)
Part 2 (pdf 17.31 mb)

June 2011 - Section 106 Technical Report
*Volume 1 of this report contains sensitive cultural resources information that is exempt from public disclosure pursuant to provisions of the Public Records Act (RCW 42.56.300). The Final EIS Cultural Resources Discipline Report contains all information from Volume 1 of the Section 106 Technical Report that is available for the public.

Summary and Introduction (pdf 2.79 mb)

Vol. 2 - Built Environment

Chapter 1 - 5 (pdf 5.76 mb)
Chapter 6 a (pdf 5.76 mb)
Chapter 6 b (pdf 5.51 mb)
Chapter 6 c - 9 (pdf 1.88 mb)

Technical Report Vol. 2 - Built Environment Appendices Part 1

Part 1 a (pdf 2.48 mb)
Part 1 b (pdf 6.55 mb)
Part 1 c (pdf 4.41 mb)
Part 1 d (pdf 5.67 mb)
Part 1 e (pdf 3.75 mb)
Part 1 f (pdf 5.03 mb)
Part 1 g (pdf 4.37 mb)
Part 1 h (pdf 4.83 mb)
Part 1 i (pdf 5.31 mb)
Part 1 j (pdf 5.42 mb)
Part 1 k (pdf 4.96 mb)
Part 1 l (pdf 4.77 mb)
Part 1 m (pdf 4.89 mb)
Part 1 n (pdf 4.73 mb)
Part 1 o (pdf 4.40 mb)

Technical Report Vol. 2 - Built Environment Appendices Part 1

Part 2 a (pdf 5.10 mb)
Part 2 b (pdf 5.36 mb)
Part 2 c (pdf 5.31 mb)
Part 2 d (pdf 5.59 mb)
Part 2 e (pdf 5.79 mb)
Part 2 f (pdf 5.29 mb)
Part 2 g (pdf 5.90 mb)
Part 2 h (pdf 5.63 mb)
Part 2 i (pdf 5.70 mb)
Part 2 j (pdf 5.08 mb)
Part 2 k (pdf 6.94 mb)
Part 2 l (pdf 5.86 mb)

April 2011 - Standards and Guidance Referenced in the SR 520, I-5 to Medina Bridge Replacement and HOV Project – Section 106 Programmatic Agreement - Appendix E

Programmatic agreement among FHWA, ACHP, WSDOT, and DAHP implementing the Federal-Aid Highway program in Washington State (pdf 155 kb)

Crime prevention through environmental design (pdf 68 kb)

Seattle Parks and Recreation Olmsted Park Furniture Standard (pdf 567 kb)

DAHP recordation standards for structures (pdf 60 kb)

Secretary of the Interior's Standards and Guidelines for the Treatment of Historic Properties (pdf 59 kb)

Context-sensitive solutions in transportation planning (pdf 27 kb)

Seattle Right of Way Manual - City of Seattle standards about street trees (pdf 72 kb)

WSDOT Standards Specifications Manual (pdf 5.08 mb)

WSDOT Roadside and Site Development - WSDOT revegetation standards (pdf 20 kb)

DAHP guidelines on archaeological data collection (pdf 3.56 mb)

WSDOT's Unanticipated Discovery Plan - Plan and Procedures for the Unanticipated Discovery of Cultural Resources and Human Skeletal Remains (pdf 29 kb)

City of Seattle requirements concerning noise variances (pdf 111 kb)

WSDOT policy and procedures on consultation about noise walls (pdf 228 kb)

WSDOT Environmental Procedures Manual (pdf 9.9 mb)

WSDOT No idle and fuel conservation policy (pdf 364 kb)

February 2011 - SR 520 I-5 to Medina Project Section 6(f) Environmental Evaluation Frequently Asked Questions (pdf 252kb)

November 2010 - SR 520, I-5 to Medina: Bridge Replacement and HOV Project Environmental Evaluation of Section 6(f) Replacement Sites (pdf 2.5mb)

April 2010 - SR 520, I-5 to Medina: Bridge Replacement and HOV Project Supplemental Draft Environmental Impact Statement Summary of Comments (pdf 2 mb)

January 2010 - Supplemental draft EIS

What is a supplemental draft environmental impact statement?

The SR 520, I-5 to Medina: Bridge Replacement and HOV Project Supplemental Draft EIS presents information about the project to inform citizens about the potential effects of project choices and to assist decision-makers in considering how the project should proceed. It builds on the work of the 2006 draft EIS by evaluating a new set of 6-Lane Alternative design options.

According to the National Environmental Policy Act and State Environmental Policy Act, an agency must prepare a supplemental draft EIS when:

  • The agency makes substantial changes in the proposed action that are relevant to environmental concerns; or
  • There are significant new circumstances or information relevant to environmental concerns and bearing on the proposed action or its impacts.

Why is the supplemental draft EIS important to me?

The supplemental draft EIS presents an important opportunity for the public to formally comment on the I-5 to Medina: Bridge Replacement and HOV Project's effects and have their comments tracked, published and addressed by the project team in the final EIS.

Supplemental draft EIS - Executive Summary
(pdf 2.91 mb)

Supplemental draft EIS - Full Document

Cover and Table of Contents (pdf 354 kb)

Chapter 1 - Introduction to the Project (pdf 1.14 mb)

Chapter 2 - Alternatives (pdf 6.04 mb)

Chapter 3 - Construction Activities (pdf 3.40 mb)

Chapter 4 - The Project Area's Environment (pdf 4.85 mb)

Chapter 5 - Project Operation and Permanent Effects (pdf 9.44 mb)

Chapter 6 - Effects During Construction of the Project (pdf 3.63 mb)

Chapter 7 - Indirect and Cumulative Effects (pdf 3.55 mb)

Chapter 8 - Other Considerations (pdf 567 kb)

Attachments

Attachment 1 - Acronyms and Abbreviations (pdf 139 kb)

Attachment 2 - Index (pdf 124 kb)

Attachment 3 - List of Preparers (pdf 147 kb)

Attachment 4 - Distribution List (pdf 133 kb)

Attachment 5 - References (pdf 210 kb)

Attachment 6 - Draft Section 4(f)/6(f) Evaluation (pdf 9.51 mb)

Attachment 7 - Discipline Reports

Agency Coordination and Public Involvement Discipline Report (3.30 mb)

Air Quality Discipline Report (2.43 mb)

Construction Techniques and Activities Discipline Report (5.21 mb)

Cultural Resources Discipline Report

Vol 1 – Main Text (5.61 mb)

Vol 2 – Att. 1, Tribal Consultation, and Att. 2, Agency Consultation (1.1 mb)

Vol 3 – Att. 3, Summary of Pre-1972 Properties/Historic Property Inventory Forms
Part 1 (6.87 mb)
Part 2 (6.92 mb)
Part 3 (5.93 mb)
Part 4 (5.02 mb)
Part 5 (8.55 mb)

Vol 4 – Att. 4, Forms for Previously Identified Properties

Description of Alternatives Discipline Report (pdf 4.1 mb)

Ecosystems Discipline Report
Part 1 (5.47 mb)
Part 2 (4.62 mb)

Energy Discipline Report (1.41 mb)

Environmental Justice Discipline Report (6.81 mb)

Geology and Soils Discipline Report (6.13 mb)

Hazardous Materials Discipline Report (6.72 mb)

Indirect and Cumulative Effects Analysis Discipline Report (6.81 mb)

Land Use, Economics, and Relocations Discipline Report (6.51 mb)

Navigable Waterways Discipline Report (3.58 mb)

Noise Discipline Report
Part 1 (7.46 mb)
Part 2 (1.71 mb)

Recreation Discipline Report (4.22 mb)

Social Elements Discipline Report (4.73 mb)

Transportation Discipline Report
Part 1 (2.19 mb)
Part 2 (8.15 mb)
Part 3 (6.48 mb)

Visual Quality and Aesthetics Discipline Report
Vol 1 – Main Text and Att. 1, VQ Assessment Matrix (9.01 mb)
Vol 2 – Att. 2, Visualizations (3.92 mb)

Water Resources Discipline Report (5.61 mb)

Attachment 8 - Range of Alternatives and Options Evaluated

Attachment 9 - Mitigation Plans

Cultural Resources Discipline Report Vol 4 – Att. 4, Forms for Previously Identified Properties