Bronson Way Bridge - Seismic Retrofit and Painting

Contact Information
Derek Akesson, Project Manager
Public Works - Transportation Systems
Renton, WA 98057

Phase 1 Construction Photos

Combined Construction, Inc.

Construction Estimate: $2.5 million (rounded)

  • TWIR - Bronson Way bridge project

Project Description

The project involves replacing existing paint on the bridge’s steel span with a new coat of protective paint, upgrading the bridge’s rocker and fixed bearings, and performing other maintenance. This work will improve the bridge’s performance during seismic activity and help preserve the steel members for years to come. By closing the bridge and using its deck to stage equipment during construction, crews can complete the work in less time. The project will be constructed in two phases.

Project Presentation:

project presentation thumbnail
Download as a pdf

Phase 1 (Completed in October 2022)

Construction activities included:

  • Installing worker access and containment system
  • Removing existing paint system on the steel main span
  • Repairing corrosion damage
  • Applying new layer of protective paint system

Phase 2 (anticipated for spring 2023)

The start date and duration of Phase 2 construction is dependent upon weather conditions. The work is anticipated to last up to 8 weeks and will require a full closure of the bridge. Construction and maintenance activities will include:

  • Temporarily elevating the bridge using jacks
  • Removing existing rocker and fixed bearings
  • Installing new concrete and rebar
  • Installing elastomeric bearing pads on concrete blocks
  • Replacing expansion joint compression seals
  • Bridge deck and curb repairs
  • Installing new waterproofing membrane
  • Asphalt paving on the bridge deck

Bridge History

The Bronson Way Bridge was built in 1939. Ownership was transferred from the Washington State Department of Transportation (WSDOT) to the City of Renton in January 2018 as part of the State Route (SR) 900 turnback agreement. It is a three span bridge that crosses over the Cedar River. The main span is carried by steel girders. The girders are coated with paint to protect the steel from corrosion. Corrosion causes section loss which results in a reduced load carrying capacity of the girders and potentially vehicle weight restrictions. Over the life of this bridge, the steel members have been repainted on a cycle of approximately every 20 years. This bridge was last painted in 1999 by WSDOT. The bridge has not received any seismic improvements to date. At the time it was designed, there was not a seismic design code for bridges. Rocker bearings are now known to perform poorly during seismic events. Replacement of rocker bearings will improve the performance of the bridge during a seismic event.

Project Updates and Schedule

  • The Bronson Way Bridge was reopened to both directions of vehicle and pedestrian travel on October 14, 2022
  • The bridge will close to vehicle and pedestrian traffic for the second phase of construction, which is anticipated for spring 2023
  • Updates on the timing of Phase 2 construction will be posted on this webpage

Construction Contract Duration

Approximately 60 working days with extended work suspension period anticipated between construction phases 1 and 2.

Construction Updates

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