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.

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 month titled Sentinels Schedule September 2019. The nights of September 1-8, 13-15, and 27-30 are shaded in various colors representing sentinel light reservations.

Dates: Thursday, Aug. 29, to Tuesday, Sept. 3
Color: Purple and Gold
Cause: University of Washington 2019 Football home opener
Description: In support of our northern neighbors, the sentinels will be lit purple and gold for the UW Huskies first football game of the 2019 season.

Dates: Tuesday, Sept. 3, to Monday, Sept. 9
Color: Blue
Cause: Prostate Cancer Awareness Month
Description: This September the SR 520 sentinel lights will "Light Blue" in partnership with the Prostate Cancer Foundation to honor Prostate Cancer Awareness Month.

Dates: Friday, Sept. 13, through Monday, Sept. 16
Color: Red
Cause: World Lymphoma Awareness Day
Description: This weekend the SR 520 Floating Bridge will "Light it Red of Lymphoma" in partnership with the Lymphoma Research Foundation in recognition of World Lymphoma Awareness Day.

Dates: Friday, Sept. 27, through Monday, Sept. 30
Color: Purple
Cause: Pacific Northwest Walk to End Alzheimer's
Description: The SR 520 sentinels will "Go Purple" this weekend for the Pacific Northwest Walk to End Alzheimer's, an annnual event that draws over 1,400 participants united in an effort to end Alzheimer's.

Dates: Monday, Sept. 30, through Friday, Oct. 4
Color: Lavender
Cause: Rett Syndrome Awareness Month
Description: October is Rett Awareness Month, and the SR 520 Floating Bridge will shine lavender this week to honor those affected with Rett, a severe neurological disorder with no cure which includes symptons such as Parkinson's, Epilepsy, Anxiety, Autism and Cerebral Palsy. Rett primarily affects girls and is typically discovered in the first two year of life.