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Nearly 20 Years of Planning Comes to Fruition: SR 99 Tunnel Opens to Traffic

Courtney Purdin | 2-06-2019

This week, the State Route 99 tunnel through downtown Seattle opened to traffic, culminating many years of planning efforts. At over $3 billion, the Alaskan Way Viaduct Replacement Program has been one of the largest transportation investments in Washington State. The now-closed viaduct carried more than 110,000 vehicles per day along the City’s waterfront. While many Seattleites will miss the view from the double-decker freeway, we will all be much safer. The structure was not expected to withstand the “big one” – the major earthquake due for the Seattle area. The possibility of damage or failure in the next earthquake gave the project a sense of urgency and drive for progress.

viewfromviaduct
View from the Alaskan Way Viaduct

Parametrix began working on the envi... (more)