Project vicinity in Tacoma.
Interchange after Westbound Nalley Valley construction. View larger graphic.
The westbound Nalley Valley construction contract built a new westbound connection between SR 16 and I-5. The new westbound viaduct and associated ramps opened to traffic in June, 2011.
This project is part of a series of projects to reduce congestion, improve safety and add HOV lanes in Pierce County. Learn more about the Tacoma/Pierce County HOV Program.
This new westbound facility eliminated the infamous "Sprague weave," in which traffic continuing on westbound SR 16 had to cross lanes with traffic exiting at Sprague Avenue. The location had previously been identified as a "high-accident-location." Since the new westbound roadway has opened to traffic, no weaving collisions have occurred.
The new westbound facility has dedicated ramps to Sprague Avenue from both northbound and southbound I-5, as well as increased capacity on the westbound bridge spanning Nalley Valley.
| Protects Environment
Stormwater drainage was expanded and improved in this project.
| Economic Incentive
Added capacity and smoother traffic flow contributes to a more efficient business environment.
Partnerships & Cooperation
|Financial Data for PIN 300567A
||Amount ($ in thousands)
|2003 Gas Tax (Nickel Funding)
|2005 Gas Tax (TPA)
|Pre-Existing Funds (PEF)
Claudia Bingham Baker
WSDOT Olympic Region
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