Project overview

Project overview

Montlake Project

The Montlake Project will improve mobility for all travelers along the corridor. The project’s key elements are listed here.

Eastbound bridge

Eastbound bridge

One of the major elements of the Montlake Project is the companion to the completed westbound bridge. The eastbound bridge will be built to modern seismic standards and extend two general-purpose lanes and one transit/HOV lane from Montlake to the new floating bridge.

Rendering of the western segment of the future eastbound bridge, looking north.

1Rendering of the western segment of the future eastbound bridge, looking north.

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Rendering of the eastern segment of the future eastbound bridge, looking north.

2Rendering of the eastern segment of the future eastbound bridge, looking north.

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Reference map showing positions of western and eastern segments of the West Approach Bridge South

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Montlake lid

Montlake lid

This project improves the Montlake Boulevard/SR 520 interchange by providing a landscaped lid with open space, transit plaza, direct-access ramps for buses and HOV, and multimodal connections.

Map of the Montlake lid area showing various features.

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Pedestrian land bridge

Pedestrian land bridge

This project builds a shared-use pedestrian land bridge over SR 520, connecting the Arboretum with East Montlake Park and the University District.

Map of the pedestrian land bridge area showing the positions of various features.

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Final project configuration

Final project configuration

Construction for the SR 520 Montlake Project is expected to be complete by early 2023. The rendering below shows the Montlake project area at completion.

Map of the final configuration of the SR 520 Montlake Project.

Project schedule

We expect the Montlake Project to be complete by early 2023. Timeframes are subject to change.

2019 2020 2021 2022 2023

Jan. 7, 2019
Notice to Proceed

January 2019–December 2020
Design project

June 2019–Fall 2019
Conduct preliminary work

Fall 2019
Shift traffic to existing westbound bridge

2019–2022
Remove existing eastbound bridge

2019–2022
Construct new eastbound bridge

2021–2022
Construct pedestrian land bridge

2019–2022
Construct Montlake lid

Fall 2021
Remove Montlake Boulevard and 24th Avenue overpasses

Fall 2021–Winter 2022
Landscape project

2023
Open new eastbound bridge to traffic

2023
Complete project

Program overview

All remaining elements of the SR 520 Program from I-5 to Lake Washington are fully funded. These elements, known as the “Rest of the West,” will provide safety and mobility improvements for the region and reconnect local communities divided by the original construction of SR 520 in the 1960s. This map shows the key elements of the Rest of the West, which will be built in phases.

Reference map showing portions of western and eastern segments of the eastbound bridge.

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dashed bright blue lineSR 520/I-5 Express Lanes Connection Project
Estimated construction start: 2020
Estimated duration: 3 years
dashed dark blue linePortage Bay Bridge and Roanoke Lid Project
Estimated construction start: 2023
Estimated duration: 6 years
dashed green lineMontlake Cut Bascule Bridge Project
WSDOT will begin additional coordination in 2020 with community stakeholders and agency partners regarding project scope
solid orange lineMontlake Project
Construction start: 2019
Estimated duration: 4‑5 years