Sound Transit E320 South Bellevue Extension

Bellevue, WA

Project Description

E320 South Bellevue project is part of Sound Transit’s 14-mile Eastlink Light Rail Extension Project to connect Seattle, Mercer Island, Bellevue, and Redmond Washington. McNary Bergeron provided construction engineering services for a cast-in-place balanced cantilever bridge using form travelers over the I-90 and 405 interchange.


Central Puget Sound Regional Transit Authority (Sound Transit)


Shimmick, Parsons JV


International Bridge Technologies

Our Role

McNary Bergeron is providing construction engineering for a cast-in-place balanced cantilever bridge using self-advancing form travelers. Construction Engineering services include cantilever erection manuals, geometry control, falsework, independent review of equipment, and support during construction.

Total Contract Value

$321 million


2017 - 2019

Construction Method and Specifications

Balanced Cantilever using Form Travelers