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Project Title & Location
SR 16 - Westbound Nalley Valley and SR 16 -Eastbound Nalley Valley and Sprague Ave. Interchange.
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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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Environmental Impacts / Compliance
NEPA re-evaluation - Assessing potential mitigation sites for 0.1 AC of wetland impact; Nalley Valley Viaduct has been identified as a possible candidate for the Register of Historic Bridges, may need to do a supplement to the Environmental Assessment; Air and Noise analysis is being re-analyzed for 2030 traffic numbers.
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Impacts to Traffic
Long-term closure of Sprague Avenue, short-term closures of southbound I-5 to 38th Street off-ramp and 38th Street to westbound SR 16 on-ramp. There will also be night-time closures on I-5, Center Street and South Tacoma Way for girder placement and other construction work.
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