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.

Looking across water to a bridge during the evening. The bridge slopes away from the camera and there is a tall tower near the right side of the picture lit up teal.

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 showing June 2018. The nights of June nineteenth through june thirtieth are shaded in various colors, representing sentinel lighting reservations.

Dates: Tuesday, June 19, through Friday, June 22
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!


Dates: Friday, June 22, through Friday, June 29
Color: Rainbow
Cause: 2018 Seattle Pride
Description: The Seattle Pride Parade is Sunday, June 24, 2018. Every year this event brings hundreds of thousands of people to downtown Seattle to celebrate inclusion, tolerance and diversity in our region. The SR 520 Floating Bridge will be sporting rainbow colors throughout the weekend and the following week in support of the annual event.


Dates: Friday, June 29, 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.