New Jersey Gov. Chris Christie (R) is once again defending his October 2010 decision to kill the nearly $9-billion Trans-Hudson Express passenger-rail tunnel project that was, at the time, the country's largest public-works project.The federal Government Accountability Office released on April 10 a report claiming that Christie—a vocal anti-debt Republican—had exaggerated New Jersey's share of the tunnel's cost.The tunnel, nicknamed the Access the Region's Core (ARC) project, was expected to double commuter-train capacity between New Jersey and Manhattan. In September 2010, Christie shut down construction, which had started a year before, to conduct a 30-day review of the project. Less
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.