SR 520 - Floating Bridge and Landings Project - Sentinel lights

What are the sentinels?

The new SR 520 floating bridge has four large towers, called “sentinels,” that mark the east and west ends of the world’s longest floating bridge. The tallest one, at the bridge’s east end, rises 123 feet above the lake’s surface. These towers not only add an architectural flair to the bridge, but also serve a critical function, allowing crews access to the bridge’s pontoon platform for maintenance.

Sentinel lighting

We illuminate the sentinels from dusk to dawn with LED lights. Teal is the standard color. Many color combinations are possible, however, which allows us to change the display color to commemorate holidays or support public events or causes of community significance.

How can I request a color change?

If you are interested in changing the sentinel lights for a public event or cause, please fill out our Sentinel Lighting Change Request Form (pdf 375 kb) and submit it to SR520Bridge@wsdot.wa.gov. Sentinel light changes are intended to recognize holidays and national and local campaigns, organizations and events of public significance. We cannot accommodate requests related to private events or political or religious events or campaigns. Details about the lighting policy and request process are listed in the request form (pdf 375 kb).

What lighting changes are coming up?

A calendar of the month of august titled sentinels schedule August 2019. The nights of august 1 to 4 and 29 to 31 are shaded in various colors representing different sentinel reservations.

Dates: Thursday, Aug. 1, to Monday, Aug. 5
Color: Blue and Gold
Cause: Blue Andels and Seafair Weekend 2019
Description: A Pacific Northwest tradition since 1950, Seafair Weekend Festival is one of the most anticipated events of the summer. The SR 520 Bridge sentinels will shine blue and gold in support of Seafair and the Blue Angels airshow performance.

Dates: Thursday, Aug. 29, to Tuesday, Sept. 3
Color: Purple and Gold
Cause: University of Washington 2019 Football home opener
Description: In support of our northern neighbors, the sentinels will be lit purple and gold for the UW Huskies first football game of the 2019 season.