SOUTH NYACK, N.Y. (CBSNewYork)The Tappan Zee Bridge‘s past, present and future are being discussed during a three-hour tour aboard a Mississippi River-style paddle boat.

As WCBS 880’s Sean Adams reported, the first of the two sold-out tours on the River Rose was being held Tuesday. The second is scheduled for Sept. 4.

Rockland Historical Society President Larry Singer said in the 1950s the Tappan Zee shaped the county.

“It changed Rockland County from a large farm community to really a suburban area,” Singer said.

“We had over 300 working farms in 1955,” he said. “Today, we have four.”

The tour covers engineering, technology, politics and planning.

Those on the tour get a close-up look at the Herculean task of building the new twin spans, billed as the largest current construction project in the country.

“When you consider the depths that they’re putting these pilings, it’s really hard to imagine how they’re doing it,” Singer said. “In future years, the next couple of years, we’ll actually be seeing them building the super structure itself.”

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