I-405/SR 167 Corridor Program

The I-405/SR 167 Corridor Program stretches from Lynnwood to Sumner, forming the only north-south highway alternative to I-5 in the Puget Sound region. As a result, the corridor experiences high daily traffic volumes from commuters and freight. Both the I-405 Master Plan and the SR 167 Master Plan recommend connecting I-405 and SR 167 to form a seamless corridor program of coordinated multimodal transportation solutions to address current and future traffic demand. The combined plans provide a 20+ year vision that includes new highway lanes, improved interchanges, direct access, expanded transit service including BRT, and a two-lane express toll lane system (SR 167 HOT Lanes and the I-405 Express Toll Lanes) and connecting communities through local multimodal improvements.

To date, we have delivered more than $2 billion in corridor improvements to the traveling public on time and on budget, starting with the Nickel Transportation Investment Package in 2003, the Transportation Partnership Program in 2005, and eventually leading to the most recent Connecting Washington Package in 2016.

With direction to use toll revenue for I-405 and SR 167 corridor projects per ESSB 5825 in 2019, we are now working toward the delivery of the next set of priority projects. Together with Sound Transit’s investments for I-405 corridor BRT, nearly $4 billion has been dedicated to implementing the I-405/SR 167 multimodal corridor vision.

Express Toll Lanes

Today, I-405 solo drivers and 2-person carpools have the choice to pay a toll for a more reliable trip in the ETLs from Bellevue to Lynnwood. ETLs operate as an expressway within a highway allowing toll-free trips for transit, vanpools and 3+ person carpools. As vehicles move into the ETLs, it frees up space for traffic in the regular lanes to move faster as well. Overall, ETLs make better use of the existing highway lanes, providing all travelers with a more reliable trip. 

In 2019, northbound peak period travelers saved an average of 12 minutes compared to the general purpose lanes. Transit riders benefit, too. When the currently planned projects open to the public, we estimate future bus rapid transit riders in the ETLs traveling between Lynnwood and Bellevue in the peak period to experience approximately 15-20-minute time savings compared to current express bus service.

With the 2015 Bellevue to Lynnwood Project and active Renton to Bellevue Project set to be complete in 2024 and planned toll infrastructure improvements coming to SR 167, WSDOT is advancing a continuous 50-mile I-405/SR 167 ETL system with a consistent customer experience throughout.

Reports

2023 I-405/SR 167 Corridor Financial Plan Report 

In response to legislative request, WSDOT updated the I-405/SR 167 Corridor Financial Plan report to address the program’s funding gap realized after moving forward with two project contracts, the I-405/Brickyard to SR 527 Improvement Project and the SR 167 Corridor Improvements Project. As summarized in report, WSDOT undertook the following activities as part of the financial analysis: 

• Confirmed that rescoping recently awarded projects would be infeasible to reduce costs and stay aligned with the 2023 legislative project list.
• Provided technical support for WSTC efforts to adjust corridor toll rates and policy as part of their toll rate-setting process.
• Consulted with the I-405/SR 167 Executive Advisory Group (EAG) and Interagency Working Group (IWG) throughout the development of alternatives, including focused updates to individual corridor stakeholders.
• Evaluated remaining project prioritization by referencing defined criteria to understand system impacts from adjusting one or more project's timing.
• Coordinated with OST regarding financial analysis of options and provided regular updates to the Legislature, the Governor's Office, and the Office of Financial Management (OFM) throughout the report development.

Report: 

2023 I-405/SR 167 Corridor Financial Plan Report (PDF 1MB)

2021 I-405/SR 167 Corridor Financial Plan Report

In response to direction from the Washington State Legislature in 2021, this report assesses the financial gaps on the legislatively appropriated projects for the I-405/SR 167 corridor resulting from traffic and revenue reductions due to the pandemic, and explores options the Governor and Legislature could consider to address the shortfall. Required by Substitute Senate Bill 5165 of the 2021-23 transportation budget, this report includes financial analysis and presents options for funding and phasing the next set of legislatively appropriated projects for the I-405/SR 167 corridor. As summarized in report, WSDOT undertook the following activities as part of the financial analysis: 

• Evaluated a phased approach to delivering the I-405, SR 522 Vicinity to SR 527 Express Toll Lanes Improvements Project to align with delivery of Sound Transit's I-405 Bus Rapid Transit (BRT) system. 
• Reviewed options to minimize the funding gap to deliver the 2021-23 transportation budget, including providing information about alternative funding sources for consideration. 
• Consulted with the I-405/SR 167 Executive Advisory Group (EAG) and Interagency Working Group (IWG) throughout development of funding and phasing scenarios. 
• Coordinated with the Office of the State Treasurer (OST) and provided regular updates to the Legislature throughout the report development. 

Report: 

I-405/SR 167 Corridor Financial Plan Report (PDF 2.6MB)

I-405 Final Recommendations Report

The I-405 Plan is not one massive construction project, but an efficient and integrated system of investments for all transportation users - cars, transit, freight, carpools, vanpools, bicyclists, pedestrians and the environment. In fact, the Plan offers an unparalleled opportunity to improve traffic while fixing and enhancing environmental resources in the corridor.

The I-405 Final Recommendations Report presents a snapshot of the projects and strategies within the I-405 Plan and documents the community partnership that led to an unprecedented agreement on a regional transportation solution for I-405.

Report:

The I-405 Final Recommendations Report (PDF 1.4MB)

I-405/SR 167 Corridor Funding and Phasing Report

This report describes the results of the work WSDOT undertook in response to the Washington State Legislature’s 2011 direction in RCW 47.56.886, authorizing express toll lanes on I-405 between Bellevue and Lynnwood. The Legislature directed WSDOT to:

• Develop a plan to fund improvements in the I-405 and SR 167 corridor, including an express toll lanes system operating on the corridor and completion of corridor capacity improvements.
• Consult with a committee of local and state elected officials, as well as transit agency representatives, from the I-405 and SR 167 corridor while developing this plan.
• Provide a final report to the Governor and Legislature.

This report covers funding and phasing for Phase 2, which would complete the express toll lanes system between Bellevue and Renton and connect with the SR 167 HOT lanes. Related to funding and phasing, the report also covers carpool policy for Phase 1 of the express toll lanes, which is currently under construction between Bellevue and Lynnwood.

Report:

I-405/SR 167 Corridor Funding and Phasing Report (PDF 3.6MB)

Executive Summary folio (PDF 469KB)

I-405/SR 167 Tolling Study - Expert Review Panel Final Report and Appendices

In response to the Eastside Corridor Tolling Study Final Report, a panel of five transportation experts from around the country met with WSDOT and provided insight on the department’s study. The panel met three times beginning in September 2010 and shared their progress with elected officials from the I-405/SR 167 corridor. Their final report addresses four areas of interest, including policy, methodology, phasing and finances.

Summary Report:

I-405/SR 167 Expert Review Panel Final Report (PDF 5MB)

Executive Summary folio (PDF 900KB)

Eastside Corridor Tolling Study - Final Report and Appendices

In May 2009, the Washington State Legislature directed WSDOT to conduct a traffic and revenue study including potential funding for future improvements and high occupancy toll or express toll lanes on I-405. The Legislature directed WSDOT to undertake the following activities as part of the study (Transportation Budget - ESSB 5352):

• Develop a plan to operate up to two express toll lanes in each direction on I-405
• Confer with the mayors and city councils for jurisdictions impacted by express toll lanes
• Engage the public to solicit their view points and identify concerns

The final task in the legislative charge is to provide a report to the Governor and the Legislature by January 2010. The following is the final report for the Eastside Corridor Tolling Study provided to the Legislature on January 21, 2010.

Summary Report:

Low Res (PDF 4MB)
High Res (PDF 9MB)

Executive Summary folio (PDF 2MB)

How can I get involved?

The I-405/SR 167 Corridor Program is committed to regular community participation and guidance that offers inclusive opportunities for meaningful, two-way conversations. Our extensive community engagement program fosters open communication between the project team, decision-makers, and the public. We provide regular updates on each project’s webpage and the team is available to meet with the public at any stage of a project. We regularly meet with organizations such as chambers of commerce, business and neighborhood associations and other local community-based organizations to share project updates and seek community feedback. To schedule a briefing for your organization or community group, or if you have questions about the program, please reach out to us through the contact information listed above. We want to hear from you.

Check back for more ways to stay involved and provide input on our projects.

Diverse and inclusive contracting

WSDOT is committed to seeing that all Washingtonians have access to the thousands of good paying jobs generated by our projects. We establish goals for each project to promote participation and inclusion of small, disadvantaged business enterprises owned by minorities, veterans or women (MSVWBE and DBE firms). See equal opportunity in contracting for more information and resources about working with WSDOT.

Commitment to diverse and inclusive contracting – WSDOT goals for state-funded projects

On projects supported entirely with state funds, WSDOT set a voluntary goal of 26 percent participation by minority-, small, veteran- and women-owned business enterprises (MSVWBEs). Please read WSDOT's Diversity Roadmap (PDF 284KB) for additional information on WSDOT's inclusive contracting goals.

I-405/SR 167 Executive Advisory Group

Overview

The I-405/SR 167 Executive Advisory Group (EAG) has been advising WSDOT on the I-405 Corridor improvements since 1999. The EAG was created to ensure corridor stakeholders could collaborate with WSDOT in the prioritization and implementation of the I-405 Master Plan and the SR 167 Master Plan. Comprised of local and state elected officials, regional transit agencies and federal transportation agencies, the EAG is a key partner for advancing multimodal corridor improvement projects that enhance user experience and bring increased reliability to one of the state’s most congested corridors.

WSDOT and the EAG have worked together to advance and deliver projects, such as the express toll lanes between Bellevue and Lynnwood and the I-405/SR 167 Interchange Direct Connector Project. The EAG meets regularly, around two to four times a year, to engage with WSDOT, represent regional priorities, and discuss future corridor needs. Secretary of Transportation Roger Millar is the EAG chair. Additionally, the agency staff-level Interagency Working Group (IWG) works closely with WSDOT on technical issues related to project delivery in and around corridor cities and counties.

Meetings

2023 Meetings

Monday, Dec. 11, 2023
Presentation (PDF 1MB)

Thursday, Sept. 14, 2023
Presentation (PDF 1MB)

Wednesday, May 24, 2023
Agenda (PDF 57KB)
Presentation (PDF 5MB)

2022 Meetings

Thursday, Oct. 6, 2022
Agenda (PDF 51KB)
Presentation (PDF 3MB)
Summary (PDF 228KB)

Wednesday, April 27, 2022
Agenda (PDF 51KB)
Presentation (PDF 5MB)
Summary (PDF 115KB)

2021 Meetings

We held four virtual EAG meetings in 2021, providing an update on current traffic operations and revenue, WSDOT and Sound Transit’s I-405 BRT project delivery schedules, funding and phasing, and overall I-405/SR 167 corridor system development

Thursday, Dec. 2, 2021
Agenda (PDF 49KB)
Presentation (PDF 1MB)
Summary (PDF 224KB)

Tuesday, Aug. 24, 2021
Agenda (PDF 50KB)
Presentation (PDF 1MB)
Summary (PDF 140KB)

Tuesday, June 8, 2021
Agenda (PDF 51KB)
Presentation (PDF 2MB)
Summary (PDF 128KB)

Thursday, Jan. 7, 2021
Agenda (PDF 25KB)
Presentation (PDF 3MB)
Summary (PDF 133KB)

2020 Meetings

WSDOT held one virtual EAG meeting in 2020. They provided updates on WSDOT’s current traffic operations and revenue, the Sound Transit realignment process and I-405 Corridor Program progress.

Tuesday, June 30, 2020
Agenda (PDF 26KB)
Presentation (PDF 3.46MB)
Summary (PDF 121KB)

EAG milestones

Since 1999, WSDOT has collaborated with the EAG, IWG and corridor-wide communities to achieve the following milestones to advance the I-405/SR 167 Corridor work:

• 1999: WSDOT kicked off the I-405 Master Plan process and stakeholder engagement.
• 2002: WSDOT adopted I-405 Master Plan, the guiding document for the corridor (PDF 1.42MB), after a three-year study and extensive stakeholder engagement.
• 2003: The EAG approved a medium-term Implementation Plan with $4.7 billion worth of projects that could be built over the next 10-15 years.
• 2008: WSDOT adopted the SR 167 Master Plan.
• 2009: The Washington State Legislature passed ESSB 5352 authorizing the Eastside Corridor Tolling Study (PDF 9.10MB), building on input from the EAG.
• 2010: WSDOT completed the Eastside Corridor Tolling Study and Expert Review Panel Study. EAG members signed an interest statement supporting the implementation of express toll lanes on I-405, which would connect with the express toll lanes on SR 167.
• 2011: EHB 1382 authorized tolling on I-405 and WSTC toll study.
• 2012: WSTC completed their toll study.
• 2013: The EAG reached consensus on several critical policy and financing matters related to the I-405 Express Toll Lanes system, including the creation of a funding and phasing report.
• 2014: WSDOT delivered the I-405/SR 167 Corridor Funding and Phasing Report (PDF 3.50MB) which was developed in consultation with the EAG.
• 2015: Former WSDOT Secretary Lynn Peterson met with the I-405/SR 167 EAG at Bellevue City Hall to discuss progress on the I-405 Master Plan and preparation for toll commencement on I-405. The Legislature passed the 2015 Connecting Washington funding package, which is a $16 billion investment that enhances the statewide transportation system and maintains critical infrastructure.
• 2016: Voters approved the Sound Transit 3 (ST3) measure to fund I-405 Bus Rapid Transit (BRT).
• 2019: The Legislature passed ESSB 5825 which officially combined the I-405 and SR 167 into one corridor account and appropriated up to $1.16 billion dollars in projects to be paid through toll revenue including bonding of toll revenue and excise taxes on fuel and vehicle-related fees.

We have delivered 15 construction projects in the I-405/SR 167 Corridor Program funded by the 2003 Nickel, 2005 Transportation Partnership Account, and Connecting Washington funds, with nearly $1.5 billion in corridor investments on time and on budget. We have been advancing projects through environmental and preliminary design to maintain construction readiness for $2 billion of additional system benefits.

Current I-405/SR 167 Corridor projects

I-405/Brickyard to SR 527 Improvement Project

• The project will extend the existing dual express toll lane system by creating one new express toll lane in each direction between south of SR 522 and SR 527.
• We will widen I-405 through the SR 522 interchange and build direct access ramps to the express toll lanes at SR 522, and build a partial direct access interchange at SR 527 to and from the south connecting to the Canyon Park Park and Ride.
• This project builds the infrastructure to support Sound Transit’s planned I-405 Bus Rapid Transit.

I-405/132nd Interchange Project

• We will construct a new on-ramp to northbound I-405 and a new off-ramp from southbound I-405 at Northeast 132nd Street in Kirkland.
• This half-diamond interchange will serve Totem Lake, the city of Kirkland’s largest employment center and designated growth area.
• The design also includes roundabouts to better manage traffic flow and sidewalk and bicycle enhancements along both sides of Northeast 132nd Street in the project vicinity.

SR 520/124th Interchange Project

• Currently, over half the trips from westbound SR 520 are traveling to the Bellevue vicinity. We are examining solutions to reduce congestion at the I-405/SR 520 interchange.
• A new project will allow westbound drivers the option to access downtown Bellevue by exiting SR 520 onto 124th Avenue Northeast before reaching the heavily congested I-405/SR 520 interchange.

I-405/Renton to Bellevue Widening and Express Toll Lanes Project

• This project creates a two-lane express toll lane system between SR 167 in Renton and Northeast Sixth Street in Bellevue.
• The existing HOV lane will be combined with a new lane in each direction to create the missing link between the existing express toll lane system between Bellevue and Lynnwood, as well as the SR 167 HOT lanes via the I-405/SR 167 Interchange Direct Connector, to create a 40-mile system of express toll lanes.

I-405/Ripley Lane Stream Connection Project

• The Ripley Lane Stream Connection Project is part of a series of fish barrier corrections planned for the I-405/SR 167 corridor.
• The project will construct new stream channels and injunction-compliant structures downstream of the new Renton to Bellevue Project culverts.

I-405/North 8th Street Direct Access Ramp Project

• The I-405/North 8th Street Interchange Project will build a new direct access ramp from the I-405 express toll lanes (currently under construction as part of the I-405, Renton to Bellevue Widening and Express Toll Lanes project) to North 8th Street in Renton.
• The new ramp will provide additional access to the mixed-use, housing and commercial growth center of The Landing shopping mall and the Southport campus in Renton.
• In 2019, the Washington State Legislature intended to fund the project with bonded toll revenue approved in Senate Bill 5825.
• The current law transportation budget provides funding for preliminary engineering for the project beginning in 2025, for construction beginning in 2027, and for anticipated project opening in 2029.

SR 167 Master Plan Update

• In 2021, the Legislature reauthorized $2.88M for the SR 167 Master Plan update.
• The SR 167 Master Plan will include stakeholder engagement that incorporates meaningful public outreach – with an equitable communities approach, analyzes existing and future conditions, and applies WSDOT’s Practical Solutions approach to identify near-, medium- and long-term multimodal transportation needs as well as potential strategies to address them. We estimate completing the plan in 2023.

SR 167 Corridor Improvements Project

• This project is comprised of the SR 167/Toll Upgrade Project and the SR 167/SR 516 to S 277th St – Southbound Auxiliary Lane Project.
• We are updating the SR 167 toll system to create greater consistency along the I-405/SR 167 corridor.
• This would upgrade the SR 167 toll equipment to be the same as the I-405 toll equipment, resulting in a continuous 40-mile I-405/SR 167 express toll lane system and a consistent customer experience in the express toll lanes.
• We plan to construct an additional one mile of general-purpose capacity by adding an auxiliary lane on southbound SR 167 between SR 516 and South 277th Street in Kent.
• The project aims to address operational challenges and will be constructed using existing shoulder pavement.

SR 167/Northbound Express Toll Lanes Extension to SR 410 and SR 512

• We will convert the existing HOV lane to an ETL from SR 18 to SR 410/512 and add tolling equipment to complete the SR 167 ETL system.
• WSDOT Olympic Region will deliver the design and construction of the HOV lane.
• WSDOT will deliver the HOV to ETL conversion as part of the SR 167 upgrade.

Current I-405/SR 167 Corridor projects that are led or funded by partner agencies

I-405/Bus Rapid Transit (BRT) (Sound Transit)

• Builds upon our I-405 Master Plan by establishing high capacity transit from the Lynnwood Transit Center to Bellevue Transit Center and Burien Transit Center via I-405 and SR 518.
• BRT relies on the I-405 express toll lane system and includes parking, station access improvements, and 11 pairs of stations, including a new transit center in South Renton and new stations at NE 85th Street in Kirkland and at NE 44th Street in Renton.

I-405/NE 85th Street Interchange and Inline BRT Station Project (Sound Transit)

• We are partnering with Sound Transit to construct a three-level interchange at NE 85th Street in Kirkland.
• The project will build an inline BRT (Bus Rapid Transit) station and rebuild local bus stops. BRT and local stops will be on the same level, providing a convenient transfer environment.
• The project also includes direct access ramps to the I-405 Express Toll Lanes (ETLs) and pedestrian and bike connections.

I-405/Brickyard Inline BRT Station (Sound Transit)

• The Brickyard station in Bothell will be a new transit-only inline BRT station facility to support I-405 Bus Rapid Transit, improving connections to the existing popular park and ride.
• We will aim to deliver this project with the I-405/SR 522 Vicinity to SR 527 Express Toll Lanes Improvement Project for construction efficiencies.

I-405/NE 44th Street (Sound Transit)

• Constructed through a funding agreement between Sound Transit and WSDOT, the NE 44th Street interchange area in Renton will add a new direct access ramps, an inline BRT station, and connections to local transit.
• The project will be completed as part of our  Renton-to-Bellevue I-405 project.

King County Eastrail (King County Parks)

• The Eastrail, formerly known as the Eastside Rail Corridor, will be an uninterrupted, 42-mile trail connecting the communities of Renton, Newcastle, Bellevue, Kirkland, Woodinville, Redmond, and Snohomish, providing new opportunities for non-motorized recreation and transportation.
• Currently, 13 miles of the Eastrail are open. WSDOT, in partnership with King County Parks, has built 2.5 miles of new paved Eastrail in Renton and Bellevue. 
• This 2.5 mile stretch of Eastrail is the result of a natural partnership; as we widened I-405 we needed to close the Lake Washington Loop Trail, creating an opportunity to improve the nearby Eastrail.
• Looking ahead to 2022, our Project team will build the Eastrail/ I-405 crossing in Wilburton. These improvements are part of the I-405/Renton to Bellevue project.

I-405/South Downtown Access Study (City of Bellevue)

• Proposed development along 114th Avenue SE, near the East Main light rail station and within the Wilburton area, has created a pressing need to identify a preferred interchange option.
• We are partnering with the city of Bellevue to study a new interchange to access I-405 in south downtown Bellevue.

Tukwila International Boulevard Station (Sound Transit)

• The Sound Transit I-405 Bus Rapid Transit (BRT) includes two planned in-line stations at the intersection of Tukwila International Boulevard and SR 518 that will connect to the existing Sound Transit Tukwila International Boulevard Link light rail station.
• The BRT stations would be located at-grade within the SR 518 right-of-way in an existing area between the SR 518 travel lanes and the on-and off-ramps to SR 518.

Completed Projects

I-405/SR 167 Direct Connector project

• Completed Feb. 2019, this project built a new flyover ramp that eliminates the need for HOV vehicles to weave through general purpose traffic to make the I-405/SR 167 system to system transfer.

I-405/Northeast Sixth Street to I-5 Widening and Express Toll Lanes (Bellevue to Lynnwood)

• Completed Sept. 2015, this project built new capacity and interchange improvements resulting in a new system of managed express toll lanes (ETLs) -Dual ETL from Bellevue to SR 522 and a single ETL from SR 522 to SR 527 in Bothell, in both directions- to provide HOV and transit users a reliable trip option for commuting.

I-405 - Northbound Peak-Use Shoulder Lane Project, SR 527 to I-5

• Completed in 2017, this project converted the existing northbound I-405 shoulder between SR 527 in Bothell and I-5 in Lynnwood to an additional, dynamically controlled, general purpose lane increasing capacity during the afternoon peak commute.

SR 167 HOT Lanes Pilot Project

• Completed in 2008, this project converted the HOV lane of SR 167 between Renton and Auburn into a high occupancy toll (HOT) lane allowing single occupancy drivers the ability to pay a toll to access the lane providing a reliable commute option.

NE 195th St. to SR 527 NB Auxiliary Lane

• Completed in 2010 this project added northbound I-405 general purpose capacity between Northeast 195th Street and SR 527 in Bothell.

NE 10th Street Bridge Crossing Stages 1 and 2

• Completed in 2009 and built in two stages, we partnered with the City of Bellevue to build a new freeway bridge at Northeast 10th Street Improving access in the north downtown Bellevue and relieving traffic pressure at the Northeast 8th Street interchange.

Renton Stage 1 Widening Project

• Completed in 2009, this project added general purpose capacity near the I-405/SR 167 interchange, an auxiliary lane to I-405, extended the northbound HOV lane of SR 167 and rehabilitate multiple ramp connections at SR 167 and SR 181.

South Bellevue Widening Project

• Completed in 2009, this project added general purpose capacity over four miles of I-405 within the city of Bellevue between 112th Avenue SE and SE 8th Street, widened bridges and removed the old Wilburton tunnel.

Renton Stage 2 Widening & SR 515 Interchange Project

• Completed in 2010, this project added I-405 general purpose capacity Between SR 167 and SR 169, built a new half-diamond interchange at SR 515 (Talbot Road) and replaced the Benson Road bridge over I-405.

Springbrook Creek Wetland & Habitat Mitigation Bank

• Completed in 2009, WSDOT and the City of Renton launched an innovative partnership to re-establish and enhance over 130 acres of wetlands in the Renton area addressing the effects of development within the city and from WSDOT transportation projects.

8th St. E to S 277th St.-Southbound HOT Lane

• Completed in 2017, this project added a lane to southbound SR 167 and extend the existing High Occupancy Toll (HOT) Lane system south in the Green River Valley. Expanding the successful 9-mile SR 167 HOT lanes to nearly 14 miles will connect King and Pierce County communities to vital employment hubs in the Puget Sound area.

Kirkland Nickel Stage 1 Widening Project

• Completed in 2007, this project added one new lane of capacity in each direction of I-405 between Northeast 85th Street and Northeast 124th Street, widened the I-405 bridge over Northeast 116^th Street, included three wetland mitigation sites and corrected a fish barrier culvert under I-405 at Forbes Creek in Kirkland.

NE 8th St. to SR 520 Braided Ramps Project

• Completed in 2012, this project built new northbound ramps to separate vehicles entering and exiting I-405 between Northeast 8th Street and SR 520 in Bellevue.
• The new ramp from the Northeast 10th Street Bridge at I-405 gives drivers direct access to SR 520 from downtown Bellevue and provides drivers with a choice to bypass or exit at 124th Avenue NE.

Visit our Flickr gallery to see photos of construction, groundbreaking events and more.

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We are committed to minimizing the effects of our work on the natural environment and our communities, factoring in considerations like noise, air quality, stormwater treatment and water resources, visual quality, greenhouse gases, historic and cultural resources, threatened and endangered species, parks and recreation lands. One example of the I-405/SR 167 team’s environmental stewardship is restoring natural stream flow and removing barriers to fish passage in streams, improving salmon habitat and approaching mitigation from a holistic watershed view.

I-405 Corridor Final Environmental Impact Statement and Record of Decision

The I-405/SR 167 Megaprogram complies with all applicable federal, state, and local environmental laws and regulations, including requirements under the National Environmental Policy Act (NEPA) and State Environmental Policy Act (SEPA). WSDOT worked with partner agencies to complete an Environmental Impact Statement (EIS) for the I-405 corridor, which was approved by the federal government through a Record of Decision (PDF 886KB) in October 2002.

The Final Environmental Impact Statement (FEIS) issuance marked a first step toward implementing the I-405 projects, a regional strategy to improve one of the most congested freeways in the state. The FEIS documents the work of a unique partnership between the local jurisdictions, elected officials and agencies within the I-405 corridor. The FEIS arrived after three years of technical work and consensus building and provides the public and decision-makers with all relevant information related to the impacts of proposed I-405 improvements. Public comments received during the Draft EIS public review period were also addressed in the document.

• FEIS Summary (PDF 774KB)
• Chapters 1 - 11 (PDF 14.08MB)
• Volume 2: Comment Responses (PDF 2.29MB)
• Volume 3: Appendices A - N (PDF 24.75MB)

Environmental review for individual corridor projects

As set forth in the EIS, WSDOT and the Federal Highway Administration have continued to conduct further environmental review as required for individual projects on the corridor. The level of environmental review depends on the scope and expected environmental impacts of a particular project.

Copies of project-level Environmental Assessments (EAs), State Environmental Protection Act Determination of Non-Significance (SEPA DNS) and Finding of No Significant Impact (FONSI) for projects actively in design or construction are linked below. Additional environmental documentation for past projects is available from WSDOT upon request.

I-405 SR 522 Vicinity to SR 527 Express Toll Lanes Improvement Project (2020-21)

WSDOT and the Federal Highway Administration issued the Finding of No Significant Impact and Errata for the I-405, SR 522 Vicinity to SR 527 Express Toll Lanes Improvement Project on July 29, 2021.

• Finding of No Significant Impact (PDF 5.6MB)
• FONSI Appendices, including Responses to Environmental Assessment Comments and Errata to the EA (PDF 14.6MB) Alternate format available upon request by contacting i405comments@wsdot.wa.gov.

WSDOT and the Federal Highway Administration published the Environmental Assessment (PDF 3.59MB) for the I-405, SR 522 Vicinity to SR 527 Express Toll Lanes Improvement Project on July 2, 2020. The comment period ended on August 6, 2020.

The State Environmental Protection Act (SEPA) Determination of Non-Significance (PDF 68.41KB) for the Project was also published on July 2, 2020.

Environmental assessment and discipline reports

• Environmental Assessment (PDF 3.59MB)
• Appendix A:  Transportation Discipline Report (PDF 7.25MB)
• Appendix B:  Noise Discipline Report (PDF 7.83MB)
• Appendix C:  Community Impact Assessment and Environmental Justice Discipline Report (PDF 5.81MB)
• Appendix D:  Air Quality Discipline Report (PDF 2.06MB)
• Appendix E:  Cultural Resources Survey (PDF 19.09MB) Alternate format available upon request by contacting i405comments@wsdot.wa.gov.
• Appendix E1:  Cultural Resources Survey Addendum (PDF 3.01MB)
• Appendix F:  Visual Impact Assessment (PDF 4.52MB)
• Appendix G:  Hazardous Materials Analysis Technical Memorandum (PDF 4.11MB)
• Appendix G1:  Hazardous Materials Analysis Addendum (PDF 2.13MB)
• Appendix H:  Recreational, Section 4(f), and Section 6(f) Resources Technical Memorandum (PDF 4.57MB)
• Appendix I:  Ecosystems Discipline Report (PDF 2.01MB)
• Appendix J:  Water Resources Discipline Report (PDF 7.26MB)
• Appendix K:  Geology, Soils, and Groundwater Technical Memorandum (PDF 2.63MB)
• Appendix L:  Draft Wetland and Stream Assessment Report (PDF 844.94KB)
• Appendix M:  Draft Wetland and Stream Mitigation Report (PDF 11.51MB)
• Appendix N:  Biological Assessment (PDF 10.66MB)
• Appendix N1:  Biological Assessment Update (PDF 1.25MB)
• Appendix O:  Cumulative Effects (PDF 1.49MB)
• Appendix P:  Environmental Scoping Report (PDF 10.63MB)
• Appendix Q:  Agency and Tribal Correspondence (PDF 24.65MB)

I-405 Tukwila to I-90 Vicinity Express Toll Lanes Environmental Assessment (2018)

WSDOT and the Federal Highway Administration (FHWA) published the Finding of No Significant Impact (FONSI) and Errata (PDF 36.66MB) for the I-405, Tukwila to I-90 Vicinity Express Toll Lanes Project on April 12, 2019.

WSDOT and the Federal Highway Administration (FHWA) signed the Environmental Assessment (PDF 13.45MB) for the I-405, Tukwila to I-90 Vicinity Express Toll Lanes Project on July 3, 2018. A 30-day comment period ended on Aug. 9, 2018. 

WSDOT published the State Environmental Protection Act (SEPA) Determination of Non-Significance (PDF 257.39KB) for the I-405, Tukwila to I-90 Vicinity Express Toll Lanes Project on July 9, 2018.

Environmental assessment and discipline reports

• Environmental Assessment (PDF 13.45MB)
• Attachment A: Transportation Discipline Report (PDF 15MB)
• Attachment B: Air Quality Discipline Report (PDF 10.25MB)
• Attachment C: Noise Discipline Report (PDF 18.98MB)
• Attachment D: Environmental Justice Discipline Report (PDF 15.25MB)
• Attachment E: Cultural Resources Survey (PDF 12.81MB)
• Attachment F: Visual Impact Assessment Discipline Report (PDF 11.16MB)
• Attachment G: Water Resources Discipline Report (PDF 10.37MB)
• Attachment H: Hazardous Materials Analysis (PDF 18.29MB)
• Attachment I: Recreational, Section 4(f), and Section 6(f) Resources Technical Memorandum (PDF 15.89MB)
• Attachment J: Geology, Soils, and Groundwater Technical Memorandum (PDF 12.18MB)
• * Attachment K: Glossary
• * Attachment L: Acronyms and Abbreviations
• Attachments M-Q: Agency and Tribal Correspondence, Cross Reference of NEPA Elements, Logical Termini, Wetland and Water Resources Maps, and Endangered Species Act Summary (PDF 35.72MB)
• * Attachment K: Glossary and Attachment L: Acronyms and Abbreviations are included in the Environmental Assessment (PDF 13.45MB).

I-405 Downtown Bellevue Vicinity Express Toll Lanes Environmental Assessment (2018)

WSDOT published the Finding of No Significant Impact (FONSI) and Errata (PDF 17.58MB) for the I-405, Downtown Bellevue Vicinity Express Toll Lanes Project on July 17, 2018.

WSDOT published the Environmental Assessment (PDF 16.04MB) for the I-405, Downtown Bellevue Vicinity Express Toll Lanes Project on April 2, 2018. WSDOT also published the State Environmental Protection Act (SEPA) Determination of Non-Significance (PDF 458KB) for the I-405, Downtown Bellevue Vicinity Express Toll Lanes Project on April 2, 2018.

Environmental assessment and discipline reports

• Environmental Assessment (PDF 16.04MB)
• Attachment A: Transportation Discipline Report (PDF 19.81MB)
• Attachment B: Air Quality Discipline Report (PDF 16.31MB)
• Attachment C: Noise Discipline Report (PDF 11.57MB)
• Attachment D: Environmental Justice Discipline Report (PDF 15.58MB)
• Attachment E: Geology and Soils Discipline Report (PDF 11.16MB)
• Attachment F: Visual Impact Assessment Discipline Report (PDF 15.99MB)
• Attachment G: Water Resources Discipline Report (PDF 7.52MB)
• Attachment H: Hazardous Materials Technical Memorandum (PDF 54.92MB)
• Attachment I: Cultural Resources Survey Discipline Report (PDF 9.69MB)

Tukwila to Renton Improvement Project (2008)

On April 4, 2008, WSDOT published an Environmental Assessment (PDF 14.8MB) for the Tukwila to Renton Improvement Project. The Environmental Assessment contains the results of our studies on how this project may affect the environment. We published the Notice of Availability for the Finding of No Significant Impact (FONSI) (PDF 16.7MB) for the Tukwila to Renton Improvement Project on July 23, 2008.

Discipline reports and technical memos

• Air Quality Discipline Report (PDF 3.93MB)
• Draft Section 4(f) Evaluation (PDF 21.6MB)
• Ecosystems Discipline Report (PDF 37.6MB)
• Environmental Justice Discipline Report (PDF 5.3MB)
• Land Use Discipline Report (PDF 11.8MB)
• Noise Discipline Report (PDF 6.1MB)
• Transportation Discipline Report (PDF 7.8MB)
• Water Resources Discipline Report (PDF 9.0MB)
• Cultural, Historic, And Archaeological Technical Memorandum (PDF 3.7MB)
• Cumulative Effects Analysis Technical Memorandum (PDF 1.6MB)
• Economics Technical Memorandum (PDF 371KB)
• Geology and Soils Technical Memorandum (PDF 6.7MB)
• Hazardous Materials Technical Memorandum (PDF 7.1MB)
• Social Elements, Public Services and Utilities Technical Memorandum (PDF 4.2MB)
• Visual Quality Technical Memorandum (PDF 2.7MB)