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?

Sentinel Schedule: December 2018

A calendar of the month of December titled sentinels schedule December 2018. Many nights are shaded in various colors reflecting sentinel lights reservations.

Dates: Saturday, Dec. 1, to Monday, Dec. 3
Color: Purple and Gold
Cause: UW Football Pac-12 Championship Game
Description: The sentinels will be lit purple and gold to cheer on the UW Husky football team in the Pac-12 Championship Football Game.


Dates: Wednesday, Dec. 5, to Thursday, Dec. 6
Color: Red, White and Blue
Cause: George H. W. Bush Memorial
Description: The sentinels will be lit red, white and blue for the national day of mourning in honor of George H.W. Bush.


Dates: Monday, Dec. 10, to Tuesday, Dec. 11
Color: Blue and Green
Cause: Seattle Seahawks Monday Night Football game
Description: The SR 520 bridge is shining blue and green to cheer on the Seattle Seahawks in their Monday Night Football home game.


Dates: Thursday, Dec. 20, to Thursday, Dec. 27
Color: White and Gold
Cause: Happy Holidays
Description: The SR 520 Bridge will shine white and gold to wish everyone a happy holiday season.


Dates: Thursday, Nov. 27, to Monday, Dec. 31
Color: Crimson and Gray
Cause: WSU Cougar Football
Description: The sentinels will be lit up crimson and gray to cheer on the WSU Cougars in their Alamo Bowl football game.


Dates: Monday, Dec. 31 through Wednesday, Jan. 2
Color: Purple and Gold
Cause: UW Husky Football
Description: The sentinels will shine purple and gold to cheer on the UW Husky football team in the Rose Bowl.