Boston's Big Dig (1991-2007)
Boston's central artery tunnel project was originally scheduled to finish in 1998 at a cost of $2.8 billion. It opened in stages through 2007, ultimately costing over $14.8 billion.
Traffic disruptions and detours stretched years beyond the original schedule.
The project became the national reference point for infrastructure cost overruns and schedule slippage.
Provides the familiar pattern of major bridge and tunnel projects drifting past their announced completion dates, which Chicago riders face with the Lake Street bridge's January 2028 estimate.
