---
title: "SR 520 Evergreen point floating bridge – United States"
url: "https://www.systra.com/en/project/sr-520-evergreen-point-floating-bridge/"
type: projects
date_published: 2022-12-01
date_modified: 2024-02-23
schema:
  @type: WebPage
language: en-US
word_count: 334
reading_time: 2 min
canonical: "https://www.systra.com/en/project/sr-520-evergreen-point-floating-bridge/"
featured_image: "https://www.systra.com/wp-content/uploads/2022/12/header_evergreen_bridge_v3.jpg"
type-market:
  - Large infrastructure
project-market:
  - Tunnels and bridges
  - Bridges and viaducts
project-service:
  - Design
  - Project Management and Construction
project-location:
  - United States
---

# SR 520 Evergreen point floating bridge – United States

![SR 520 Evergreen point floating bridge – United States](https://www.systra.com/wp-content/uploads/2022/12/header_evergreen_bridge_v3.jpg)

**The SR 520 Evergreen Point Floating Bridge is a 2,652m long project crossing Lake Washington near Seattle, in the USA, combining both floating and fixed base bridge segments.**

## A unique design

The unique construction consists of a 5,135ft (1,566m) long low-rise structure
of precast segments supported at a typical 9m spacing on top of the floating
bridge. This innovative two-way post-tensioned structure is designed to be low
profile, with a maximum thickness of 2.5ft (0.76m) with a total deck width of
113’-4” (34.6m) carrying 6 lanes of traffic and a pedestrian walkway.

SYSTRA is responsible for technical oversight and construction engineering for
the cast-in-place segmental twin box-girder long span at the east side of the
project, which has a total length of 192m and a main span of 98m. Both
structures are pre-designed to be expandable for two additional mass transit
lanes in the future.

## Numerous awards

The SR 520 Evergreen Point Floating Bridge has received the following honors:

- 2017 American Council of Engineering Companies
- Grand Conceptor Award
- 2016 Design-Build Institute of America
- National Award of Merit
- Excellence in Design

## Project Key figures

- Total length: 1,566m
- Width: 34,6m
- Thickness: 0,76m
- 6 traffic lanes and a pedestrian walkway
- 77 concrete pontoons
- 58 anchors
- 74,000 vehicles per day

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