Interbay Trail Connections Project

What's happening now?

We're continuing our work on the Interbay Trail Connections project through November and into December. Neighbors and travelers in Magnolia have asked questions about design and longer travel times, as well as sent positive feedback about the protected bike lanes.

We're working on a separate communication that will be sent to everyone who's written in about the project so far that can hopefully answer questions and address next steps for community engagement. In the meantime, we want to let everyone know about what construction work lays ahead in the next few weeks:

  • Materials we've been waiting on are starting to arrive. We hope to install the plastic posts separating the bike facilities from general lanes as soon as next week. And then add green pavement markings at intersections and other locations where bike lanes and drive lanes cross along 20th Ave W, Gilman Ave W, and W Government Way as soon as the following week. Pavement marking installation is weather-dependent.
  • Once the bike facilities get closer to opening, we'll make the new bike signal at W Dravus St and 20th Ave W operational.
  • On W Emerson Pl near the intersection at Gilman Ave W, we’ll also install a concrete barrier to separate people biking from people driving. The barrier will also add protection to the bridge structure by making it less likely that a vehicle could damage the railing.
  • South of W Dravus St, we’ve completed a new curb along the east side of 20th Ave W that closed the gravel right of way area to vehicles.

In general, the construction details for this work include:

  • Typical work hours are 7AM – 7PM weekdays
  • People biking on the east/north side of these streets will merge with general traffic
  • 1 travel lane in each direction will remain open
  • Temporary on-street parking restrictions on the east/north side of the street – please make note of details on our temporary "no park" signs
  • Flagger at impacted driveways
  • Please look out for temporary traffic control signs alerting people of the new striping and any closures or revisions ahead

This project grows our all ages and abilities bike network to improve safety and connectivity, and build upon previous investments including the Elliot Bay Trail, and Ship Canal Trail. We've been updating the community about this project since last summer.

Scroll or jump down to see the project-area map and how the streets will be re-designed to include new protected bike lanes. Sign up to receive construction updates via email. We'll be reaching out directly to residents before construction begins.

Project Overview

We're about to begin construction on a transportation safety and mobility project in the Interbay and Magnolia communities to better connect major trails.

This project includes redesigning 20th Ave W, Gilman Ave W, W Government Way, and W Emerson Pl to include protected bike lanes and more intuitive and comfortable intersections that keep people moving. It'll add 2-way protected bike lanes on the north and east side of the streets. There are on-street parking impacts on W Government Way. See the map below for more information.

We're also adding a new bike signal at a redesigned intersection of 20th Ave W and W Dravus St, and updating intersection design at Gilman Ave W and W Emerson Pl, and at Thorndyke Ave W and 20th Ave W. A new marked crosswalk will be added across W Government Way at 30th Ave W. See plan set for details.

Project Details

Project map
Overview map (click to enlarge)

Cross sections
Cross sections (click to enlarge)

Project Background

Creating protected bike lanes on the route between the Ship Canal Trail and the Elliot Bay trail via Gilman Ave W and W Emerson Pl is called out in the city's Bicycle Master Plan (BMP) as a catalyst project. Extensive public outreach and engagement guided the plan's development. Seattle multi-use trails link neighborhoods to business districts and create connections with recreational and natural areas within the Puget Sound region. Multi-use trails contribute to our mission to deliver a safe, reliable, efficient, and socially equitable transportation system that enhances Seattle's environment and economic vitality.

When we drafted our latest BMP implementation plan, this project was given a high priority because it completes a large segment of the all ages and abilities active transportation network we're building across the city. It also leverages the investments we already have by connecting more people to existing trails.


Fall 2017

Construction begins.


These projects are funded by the 9-year Levy to Move Seattle, approved by voters in 2015.

Project Materials


We began engaging with people who live, work, and travel through Interbay and Magnolia last summer to learn how people would like to use the streets. As construction soon begins, we remain committed to building a productive, inclusive, and collaborative relationship with all who live, work, or travel in the project area. Please contact us with any questions.