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?

Tonight, the sentinels will be lit red to celebrate the Special Olympics 50th Anniversary.

SR 520 Sentinel lights - Special Olympics’ 50th Anniversary

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 July titled sentinels schedule July 2018. The nights of July 1 through July 8 and July 19 through July 22 and shaded in various colors representing sentinel lighting reservations.

Dates: Friday, June 29, through Tuesday, July 3, and Thursday, July 5 through Monday, July 9
Color: Purple
Cause: Special Olympics 2018 USA Games 
Description: The Special Olympics USA Games are coming to Seattle this summer and the SR 520 Floating Bridge will be lit purple in support! The USA Games showcase the abilities of athletes with intellectual disabilities and the impact of Special Olympics through world-class competition, inspirational experiences, and modeling inclusion for all. The 2018 USA Games will be held July 1-6, 2018.


Dates: Tuesday, July 3, through Thursday, July 5
Color: Red, white and blue
Cause: 4th of July
Description: In honor of U.S. Independence Day, the sentinels will shine red, white and blue!


Dates: Thursday, July 19, through Monday, July 23
Color: Red
Cause: Special Olympics 50th Anniversary - Light Up for Inclusion
Description: The Special Olympics is celebrating 50 years of Unity and Empowerment. The spark that became today's Special Olympics movement ignited at the first International Summer Games in Chicago, in 1968. This summer, the Special Olympics is launching a yearlong global 50th Anniversary celebration. Join us as we play together, learn from each other and chart an inspiring course for the future!