SR 520 Trail Grade Separation

Location: The 520 Trail at NE 40th Street

Project Phase: Design

Estimated Timeline: Construction is anticipated to begin in Summer 2019 with completion in Fall 2020.

Project Manager: Peter Dane may be reached at 425-556-2816 or

Page Last Updated: 03/13/18

Project Overview:  Washington State has provided funds to grade separate the 520 Trail from vehicles at NE 40th Street. The project will construct a tunnel under NE 40th Street near the westbound 520 ramps.

520 Trail Grade Project Map