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Project Title & Location
SR 16 / I-5 - Westbound Nalley Valley, Tacoma.
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Project Description
This project is the first of three projects to rebuild the I-5/SR 16 Nalley Valley interchange in Tacoma. The existing bridges are too narrow to carry additional lanes and the unique structure-type prevents widening. This project improves safety and increases mobility by eliminating traffic weave, adding new lanes and building dedicated ramps to Sprague Avenue. Work includes building a new westbound viaduct, new ramps between SR 16 and Sprague Avenue and new ramps from I-5 to WB SR 16.
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Contractor/Consultant
Project not yet advertised or awarded.
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Recent Progress
Design: The Project Management Plan update is complete. Utility relocations are on schedule for relocations prior to advertisement date, with one exception. That exception is a sanitary sewer relocation, which will be handled as a separate contract administered by the construction office prior to and during advertisement. Design of roadway, traffic, hydraulic, structures and other project elements are progressing toward the 90% Region Review scheduled for March 2008. The Plan for Approval is approaching completion. Continued coordination is occurring with the City of Tacoma on traffic impacts. A draft Maintenance of Traffic agreement/Memo of Understanding has been initiated with the city. The environmental schedule is being incorporated into the design schedule.
Construction
The constructability review with the contruction office will begin in January 2008.
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Design Construction Impacts
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Environmental Impacts / Compliance
NEPA re-evaluation - On track.
Wetland Mitigation - Site has been identified, on track.
Environmental Permits - On track.
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Impacts to Traffic
Long-term closure of Sprague Avenue and associated Sprague/SR 16 ramps, short-term closures of southbound I-5 exit to 38th Street and 38th Street on-ramp to westbound SR 16. Night closures on I-5, Center Street and South Tacoma Way for girder placement and other construction work.
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