Evergreen Point Floating Bridge

Floating bridge carrying SR 520 across Lake Washington, Seattle.

At a glance

Source	Author	Role	In one line
The Hidden Engineering of Floating Bridges	Wesley Crump	subject	The article uses it as the example of elevated approach spans that let ships pass beneath, and describes how contractors embedded heating pipes in the pontoon base slabs for the replacement bridge to control thermal…

The Hidden Engineering of Floating Bridges — Wesley Crump (2025)

Source: Original · Readwise highlight

The Evergreen Point Floating Bridge includes elevated approach spans on either end, allowing ships to pass beneath before the road descends to water level.

• Role: subject
• In the article: The article uses it as the example of elevated approach spans that let ships pass beneath, and describes how contractors embedded heating pipes in the pontoon base slabs for the replacement bridge to control thermal cracking; a post-tensioning flaw caused costly change orders and delay. It is named as one of the four of the world’s five longest floating bridges clustered in Washington.
• Why it matters: Illustrates modern pontoon construction and navigation solutions; secondary to Murrow and Hood Canal.