SR 520 - Floating Bridge and Landings Project - What's happening now?

Lane and ramp closures

For the most up-to-date information about SR 520 construction activities and planned road closures, check our SR 520 Construction Corner and its interactive construction map.

Light from new bridge

Over the past year, WSDOT worked with lakeside residents north of the bridge to evaluate several different options for reducing nighttime light visible from light fixtures along the bridge's bicycle and pedestrian path.

During a June 2017 community meeting, the attendees agreed that installation of louvered shields on the light fixtures was the best option for addressing community needs and meeting established safety and cost criteria.

Bridge crews completed installation of specially manufactured light shrouds in early October 2017.

Shared-use path lighting updates

Meetings and materials

In June 2017, WSDOT hosted a community meeting to discuss WSDOT’s evaluation of the shared-use path's lights and potential solutions:

In November 2016, WSDOT and representatives from the 46th Legislative District hosted a community meeting to discuss WSDOT’s evaluation of the path's lights. Linked below are the materials presented at the briefing:

In November 2016, WSDOT staff met with elected officials to review the latest results from evaluations of the lights along the regional shared-use path. See the materials presented at the briefing (pdf 2.2 mb).

If you have questions or comments concerning lighting on the new bridge, please contact us at  

Noise from new bridge

The westbound lanes of the new SR 520 floating bridge opened to traffic in April 2016. Soon after, Eastside residents complained about noise that seemed to be coming from the new bridge. Residents of Seattle’s Laurelhurst and Madison Park neighborhoods voiced similar concerns.

In response, WSDOT conducted an investigation that included collecting sound measurements on both the old and new floating bridges. While the measurements showed that noise from the new bridge’s expansion joint fell below the Federal Highway Administration threshold for needing noise abatement, the city of Medina requested that WSDOT investigate ways to modify the joint to reduce the noise. In June 2016, WSDOT committed to working with the city of Medina and the expansion joint manufacturer, Mageba, to explore options for further noise reduction.

Pilot project

After meetings with the city of Medina, evaluations of potential options, and draft pilot-project proposals from Mageba, WSDOT determined that a pilot project would require legislative authorization and funding because of the project duration and estimated costs.

The 2018 state Legislature appropriated $181,000 for WSDOT, in coordination with the University of Washington's mechanical engineering department, to study ways for reducing the noise of traffic crossing modular expansion joints like those on the SR 520 floating bridge. The study not only will evaluate materials or products that could lessen such noise, but also the cost and time required to implement each potential noise-cutting method.  

The west end of the new bridge is still in an interim configuration as WSDOT and our contractors work to complete parallel west approach bridges between Montlake Boulevard and the new floating bridge.

Meetings and materials

We are keeping track of those who notify us about sounds from the new bridge and will include everyone in future updates. If you have questions or comments concerning this noise question, please contact us at and include on your email.