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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
EnviroIssues, Parsons Brinckerhoff, HDR
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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. Final report anticipated March 31, 2008.
ERP – Ceiling Panel Layout and Monitoring Event
The team will hold an acoustics expert review panel in late April to determine how the ceiling panel test section should be configured and recommend a design that accounts for project constraints and effectively reduces reflected noise.
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Design Construction Impacts
Construction is expected to begin in late spring/summer of 2009. The work will involve the placement of a test section of ceiling panels 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
Environmental Impacts / Compliance:
A Shoreline Permit Exemption received on 12/19/07 for the south approach staging area.
A Shoreline Permit Exemption is also expected for the north approach staging area. The project team is waiting on the final documentation.
Requests for noise variances for night time work are planned to be submitted to the City of Seattle later this year.
No other environmental permits are expected for the project.
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Impacts to Traffic
Work related to traffic control strategies will being next quarter. This 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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