Project Title & Location
SR 16 - Westbound Nalley Valley and SR 16 -Eastbound Nalley Valley and Sprague Ave. Interchange.

Project Description
This project is the first of three projects to improve the SR 16/I-5 Nalley Valley interchange in Tacoma. The existing Nalley Valley bridge is too narrow to carry additional lanes and its unique structure prevents widening the existing bridge. Reconstructing Westbound SR 16 prepares for future HOV lanes and direct HOV ramps to SR 16 and I-5. This project sets the stage for rebuilding the Eastbound Nalley Valley bridge and the Sprague Avenue Interchange.

Contractor/Consultant
Project not yet advertised or awarded.

Recent Progress

Design: The project team has completed a 60% design review and is currently implementing operational design improvements.

Construction: The project is on track for construction bidding in March 2008.

Design Construction Impacts

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.  

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.

Planned vs. Actual Expenditures
(Total Project Cost)

Nickel funds included in above costs

2005 Transportation Partnership Account