David Capobianco was a toddler in 1964 when the Verrazano-Narrows Bridge slowly soared over his neighborhood of Bay Ridge, Brooklyn, and tethered it to Staten Island. As he grew up, the improbable notion of assembling something so big and of such gossamer design propelled him to become a civil engineer.

Now after years of public argument and indecision, the first new colossal steel bridge in the New York area since the Verrazano is finally beginning to rise over one of the most spacious stretches of the Hudson River, a replacement for the decaying Tappan Zee, the longest bridge in the state, and Mr. Capobianco, 51, is its project manager.

“All other projects I’ve worked on are dwarfed by this — the size of the equipment involved, the enormity of what we’re doing, the number of people involved,” he said.