Viaduct retrofit is cheaper and reasonable
The state and the city have been pushing the tunnel at a cost of $4.5 billion and the rebuild at $3.5 billion and have tried to ignore everything else.
Recall that the viaduct is some 2.2 miles long, south of the Battery Street tunnel consisting of some 64 three-span structural units. But only two units were damaged during the Nisqually earthquake of Feb. 28, 2001 and those were repaired and the viaduct reopened to traffic.
The project now includes the lowering of Aurora and adding new bridges across Aurora.