Minnesota Department of Transportation bridge engineer Dan Dorgan said the term "structurally deficient" is a Federal Highway Administration rating.

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Former bridge engineer Harry Yeadon, 86, remembers the day.

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Construction is projected to take five years, including three years of active work on the roadway, and be completed in 2017, said Joe Keane, the bridge division's chief engineer.

WSJ: Plan to Aid Staten Island Commuters

In 1993, the French department of public works staged an open competition to build a high bypass bridge between plateaus at the top of the gorge, based on an initial concept by its engineer, Michel Virlogeux, who proposed a multispan, cable-stayed bridge with a phalanx of seven masts supporting cable fans.

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Every engineer will tell you that the bridge should not be wider than its capacity to support people or load.

ECONOMIST: Letters

He became the department's Essex County resident engineer in January 2005, overseeing road and bridge projects and all DOT maintenance personnel in the county.

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W. Roebling III, a descendant of master engineer John A. Roebling, who is famous for designing and building the Brooklyn Bridge.

FORBES: Magazine Article

Mr Winwood, a retired engineer, says it is also worrying not knowing whether it could be the actual movement of the bridge that had caused the problem, or if it was down to bad workmanship or using the wrong materials.

BBC: Poole's Twin Sails bridge problems 'not acceptable'