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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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Recent Progress
Team meeting kickoff was held on December 10, 2008. WSDOT stakeholders include the following groups: Bridge Preservation, Bridge and Structures, Bridge Maintenance, Construction Traffic, Design, Environmental (both Air and Noise and Permits sections), Electrical, and Signals.
On December 19, 2007, the team conducted the I-5 Ship Canal Bridge Noise Reduction Project, Contracting Methods Workshop. During the workshop three contracting methods were discussed: design-build, design-bid-build, and Construction Manager General Contractor (CMGC).
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Environmental Impacts / Compliance
Shoreline Permit Exemption Received on 12/19/2007. Requests for noise variances for night time work are planned to be submitted to the City of Seattle.
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Impacts to Traffic
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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