City Retrofitting Viaduct: 400 Gazillion Dollars
posted by December 5 at 16:31 PMon
According to the state:
Repairing Viaduct would cost $2.3 billion, state says
Retrofitting, rather than replacing, the Alaskan Way Viaduct will cost $2.3 billion, according to a study by the Washington State Department of Transportation.
The new numbers, released today, say the cost of a retrofit would be almost as much as a new elevated structure. It said T.Y. Lin has developed a plan that could retrofit the viaduct, but the costs are prohibitive.
“For an earthquake of serious severity likely to have a one in 10 chance of occurring in the next 50 years, the standard would require that the viaduct, though it might be damaged, would still be usable after repairs,” said the new state report. “T.Y. Lin’s report outlines what would be necessary to meet this standard, including new bracing and other improvements, and also strengthening the footings and piers located in the weak and earthquake vulnerable soil on which the viaduct rests.”
WSDOT estimates that replacing the viaduct with a new elevated structure would cost between $2.2 and $3.3 billion; replacing it with a scaled-back cut-and-cover tunnel would cost between $3.6 and $5.6 billion.
Backers of a retrofit have long described their preferred viaduct solution as the sensible, money-saving option. It’ll be pretty hard for them to claim that now.