McGraw St Bridge Seismic Improvements Project

Updated: May 20, 2022

What's happening now?

We're designing seismic retrofits to the McGraw St Bridge, located between 2nd Ave N and Nob Hill Ave N. These improvements will help strengthen the bridge to better withstand seismic events like earthquakes. We're getting ready to select a contractor and anticipate construction beginning as soon as Fall 2022. Construction should last approximately 7-8 months.

To complete the work as safely and efficiently as possible, the bridge will be closed to people walking, biking, rolling, and driving for the duration of construction. We understand this closure will impact everyone who uses the bridge regularly and will do what we can to minimize impacts. We will provide more information about detours and what neighbors can expect prior to construction beginning.

To stay up to date with the latest project information, sign up to join the project listserv. 

Project overview

Earthquakes could have major negative effect on Seattle's bridges. To address this risk, the City of Seattle established a bridge seismic retrofit program to assess the seismic vulnerability of the City's bridges and to prioritize limited funding to strengthen bridges so they can better withstand the potential impacts of an earthquake.  

As part of the Levy to Move Seattle, 16 bridges were selected for seismic retrofits, including the McGraw St Bridge. The McGraw St Bridge is an older bridge constructed in 1936 and does not meet current seismic design standards for bridges. The bridge spans the Wolf Creek Ravine Natural Area in the Queen Anne neighborhood, and it is used by people driving, biking, walking, and rolling.  

We're not planning on changing the current use and operation of the bridge. The seismic retrofits will include several modifications to seismically strengthen the existing bridge components and make the bridge less vulnerable in the event of an earthquake. Modifications include: 

  • Installing carbon fiber wrapping to strengthen the bridge's crossbeams, columns, and arches
  • Strengthening the existing arch with a concrete infill wall
  • Installing concrete blocks and supportive shells for the bridge's columns and crossbeams
  • Repairing cracks and damaged concrete
  • Replacing the expansion joints at both ends of the bridge 

Project Map

Click on map to explore it as an accessible PDF.

Photo of the existing McGraw St Bridge with a person wearing a bright reflective jacket running on the bridge.

Photo of the existing McGraw St Bridge. 

What to expect during construction 

To complete the work as safely and efficiently as possible, the bridge will be closed to people walking, biking, rolling, and driving for the duration of construction. We understand this closure will impact everyone who uses the bridge regularly and will do what we can to minimize impacts. There will be signed detours. We will provide more information about detours and what neighbors can expect prior to construction beginning.

We currently anticipate the following construction impacts:

  • A full closure of the bridge during construction, with detours for people walking, biking, rolling, and driving
  • Noise, dust, vibrations, and construction equipment staged on the bridge and within the work area
  • Temporary on-street parking restrictions, with "no park" signs placed 72 hours in advance
  • Typical weekday work hours of 7 AM - 5 PM, Monday through Friday 

Schedule*

  30% Design   Complete
  60% Design   Complete
  90% Design   Complete
  Construction begins   Fall 2022

 

*The schedule is subject to change. 

Once construction begins it is scheduled to last approximately 7-8 months. Please note this work is weather dependent.

Funding

The total project estimate is $3 million and is funded through the Levy to Move Seattle. Approved by voters in 2015, the 9-year, $930 million Levy to Move Seattle provides funding to improve safety for all travelers, maintain our streets and bridges, and invest in reliable, affordable travel options for a growing city.

Get involved

We're committed to keeping you informed and working with neighbors to limit construction impacts to the extent feasible. Here are some more ways to get information about the project:

Materials

  • Project materials will be posted as developed.

Translation and interpretation 

If you need this information translated, please call (206) 775-8734.

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