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.


What color are the sentinels tonight?

Right now, the sentinels are displaying their normal teal color.

A tower that is part of the state route 520 floating bridge is lit up teal blue as the bridge extends over water into the distance in the evening.


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 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 January titled sentinels schedule January 2019. The nights of January 1, 4, 5, 6, and 31 are shaded in various colors representing sentinel lighting reservations.


Dates: Tuesday, Jan. 1, to Wednesday, Jan. 2
Color: Purple and Gold
Cause: UW Football Rose Bowl Game
Description: The sentinels will be lit purple and gold to cheer on the UW Husky football team in the Rose Bowl game.


Dates: Friday, Jan. 4, to Monday, Jan. 7
Color: Green and Blue
Cause: Seattle Seahawks football playoff game
Description: The sentinels will be lit green and blue to cheer on the Seahawks in their football playoff game.


Dates: Thursday, Jan. 31, to Monday, Feb. 4
Color: Red
Cause: Wear Red Day - American Heart Association
Description: The SR 520 bridge is shining red for National Wear Red Day - an annual day of awareness hosted by the American Heart Association regarding heart disease, the nation's leading killer of women.