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 August titled sentinels schedule August 2018. The nights of august 1 through august 6 and august 9 through august 13 are shaded in various colors reflecting sentinel lights reservations.

Dates: Wednesday, Aug. 1, through Monday, Aug. 6
Color: Blue and Gold
Cause: The Blue Angels and Seafair Weekend 2018
Description: A Pacific Northwest tradition since 1950, Seafair Weekend Festival is the culmination of the summer-long Seafair Festival. The Blue Angels air show is the most anticipated part of the weekend, giving fans the chance to see incredible acrobatics done by a variety of aircraft.


Dates: Thursday, Aug. 9, through Monday, Aug 13
Color: Orange
Cause: Obliteride
Description: This year Fred Hutchinson Cancer Research Center is celebrating the sixth annual Obliteride - a walk/ride fundraiser to support cancer research at Fred Hutch.