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She celebrated the achievements of Emily Warren Roebling, who spent years helping with the planning and building of the Brooklyn Bridge after her husband, Washington Roebling, the bridge’s chief engineer, fell sick and was bedridden.

It takes 25 minutes to walk to Cincinnati over the John A. Roebling Suspension Bridge, which the celebrated engineer designed before his more famous Brooklyn Bridge.

At the library at Rensselaer Polytechnic Institute, chief engineer Washington Roebling’s alma mater, Mr. McCullough found what he described as “the legendary trunk of letters in the attic.”

While writing “The Great Bridge,” he grew a beard, like the engineer Washington Roebling.

Soon, Masnah was getting dozens of commission requests, so many that he started putting them all in one place: the Roebling apartment building.