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Project Title & Location
I-5 Ship Canal Bridge Noise Study,
Seattle
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Project Description
WSDOT has been evaluating new and innovative noise-reducing elements to address freeway traffic noise in neighborhoods surrounding the I-5 Ship Canal Bridge. We have identified three potential options for reducing noise: 1) For reverberant and/or reflective noise: Noise-absorptive materials on the ceiling above the I-5 express lanes. 2) For direct noise: Street-level noise walls near the bridge approaches. 3) To reduce noise at the source: Replacement or rehabilitation of the pavement.
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Contractor/Consultant
HDR and Parsons Brinckerhoff
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Recent Progress
Design-bid-build was selected as the preferred contracting method for this project.
Design
The draft structural capacity report has been completed and reviewed. The final report was received on May 5, 2008.
Acoustics ERP
In April 2008, the team convened a group of acoustics experts to evaluate noise-reducing elements for freeway noise from the Ship Canal Bridge. Experts identified different types of noise coming from freeway traffic on the Ship Canal Bride, and assessed different options to address each type of noise. A final report is expected in mid-June.
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Design Construction Impacts
Construction is expected to begin in summer of 2009 and may involve the placement of a ceiling treatment test section on the I-5 Ship Canal Bridge. Details of the design will be finalized as plan preparation is completed.
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Environmental Impacts / Compliance
A Shoreline Permit Exemption Received on 12/19/2007 for the south approach staging area.
A Shoreline Permit Exemption is expected for the north approach staging area. The design office is waiting on the final documentation.
No other environmental permits are expected for the project.
Requests for noise variances for night time work are planned to be submitted to the City of Seattle later this year.
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Impacts to Traffic
Work related to Traffic Control Strategies will begin next quarter. The work could involve modifications to off-ramps and possible lane restriction on I-5 for night work. Details of these impacts will be finalized as plan preparation is completed.
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Milestones |
Scheduled |
Attained |
Milestone Outlook |
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Begin Preconstruction Engineering
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February 2006
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February 2006
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Preconstruction Engineering continuing.
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Environmental Document Complete
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Jan 2009
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Rescheduling for June 2009 to accomodate additional design efforts
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Right of Way Certification Complete
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Mar 2009
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Rescheduling for June 2009 to accomodate additional design efforts
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Advertisement Date
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April 2009
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Rescheduling for October 2009 to accomodate additional design efforts
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Operationally Complete
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April 2010
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Rescheduling for September 2012 to accomodate additional design efforts
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