Overview
From October 2007 to April 2008, we strengthened four Alaskan Way Viaduct column footings between Columbia Street and Yesler Way to prevent further sinking. This section had settled approximately five-and-a-half inches into the ground since the 2001 Nisqually earthquake.
Crews drilled a series of steel rods surrounded by concrete into stable soil, and added a layer of reinforced concrete to tie the new supports to the existing column footings.
How you benefit:
Improves safety
This project limits settlement in this area of the viaduct and prevents further damage to the structure. This is a temporary repair that allows the viaduct to remain open for traffic until it's replaced. We continue to closely monitor any further deterioration.