Big changes in Nalley Valley | Transportation

Crews rebuilding the Nalley Valley Viaduct are springing ahead and shifting westbound SR 16 traffic onto a new temporary roadway and closing the ramp to Sprague Avenue for one year over the weekend, of March 13 and 14.

Those revisions are expected to contribute to slowdowns and motorists should plan for delays and congestion from both directions of I-5 to SR 16; from I-705 to I-5; and westbound SR 16 at Union Avenue.

Weather permitting; crews will close westbound SR 16 overnight from 10 p.m. Saturday, March 13 to 10 a.m. Sunday, March 14. During the closure, crews will construct the crossover pavement from the existing westbound viaduct to the existing eastbound viaduct.

They will also complete placement of the traffic barrier and finalize the detour lane striping.

Once this work is complete, westbound traffic will be rerouted to the temporary roadway, making way for new roadways and bridges. The Sprague Avenue exit, which carries 12,000 vehicles a day, will remain closed through project completion in spring 2011.

Each day, an average of 65,000 vehicles travel westbound on the viaduct.

While disruptive, the work is a sign that this $120 million project is progressing. This project is funded by the 2003 Nickel transportation package, employs about 200 construction workers and supports an estimated 620 jobs.

WSDOT says once the project is complete, new westbound bridges and Sprague Avenue ramps eliminate one of Pierce County’s worst bottlenecks and reduce collisions by an estimated 60 percent, or 16 fewer per year.