A 17-acre hillside forest in Setauket, once home to potato farms, is Long Island’s newest state parkland.

“Today, time stands still; we freeze the landscape permanently in these 17 acres,” said Assemb. Steven Englebright (D-Setauket) as officials unveiled the parkland’s new plaque Friday.

The woodland is bordered by Watson Lane and Main Street. George Washington traveled through the area on April 22, 1790, to thank his spies for saving him and “his revolution,” said Englebright, chairman of the Assembly Environmental Conservation Committee.

The state Department of Environmental Conservation, Englebright and other officials, announced the $3.4 million purchase from the Fitzsimmons family of Setauket.

Preventing the forest from ever being developed will protect the Conscience Bay watershed from polluting runoff, officials said.

A 17-acre tract has been added to the Patriots Hollow State Forest in Setauket. Unveiling the sign on Friday, April 21, 2017, are, from left, Assemb. Steve Englebright, state DEC regional director Carrie Meek Gallagher, Suffolk County Legis. Kara Hahn, Deputy County Executive Peter A. Scully, and Brookhaven Councilwoman Valerie Cartright. Photo Credit: Ed Betz

DEC Commissioner Basil Seggos said in a statement: “New York State is fortunate to acquire a property so central to Setauket’s environment and history.”

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The tract expands the 28-acre Patriots Hollow State Forest that the DEC acquired in 2009, extending the Setauket-Port Jefferson Greenway.

It complements the nearby Detmer Farm, preserved in 2006 through Suffolk’s Farmland Preservation Program.

The forest of red cedar, gray birch and poplar trees and a few invasive species, such as black locust and Norway maple, was home to potato farms until the 1950s, officials said.

The Fitzsimmons family, who still live down the hill from the new parkland, began putting the tract together after moving to North Country Road in 1939.

“The Fitzsimmons parcel is the final piece in a puzzle that the community and its elected officials have been working on for nearly two decades,” said Suffolk Deputy County Executive Peter A. Scully.

While serving as Long Island regional DEC director, Scully helped drive the acquisition of Patriots Hollow State Forest, the location of Patriot’s Rock. The boulder shielded Washington’s troops while they fired on the British in 1772, local experts say.

Several speakers stressed that the new parkland fulfills dual goals of protecting the environment and ensuring history is not forgotten. “Nothing reinforces the integrity of an historic district like open space,” said Robert Reuter, a member of Brookhaven’s Historic District Advisory Committee.

The state drew on environmental protection funds for the purchase, and Englebright saluted the Fitzsimmons’ generosity, as they probably could have obtained a higher price had they let developers bid on the land.

Instead, “they waited patiently as many of us put the resources in place to fairly compensate them for their many decades of work,” he said.

The forest could open for hikers after trails are cleared as soon as next spring or summer, said DEC Long Island regional director Carrie Meek Gallagher.

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Suffolk County Legis. Kara Hahn (D-Setauket) underlined the site’s unique importance.

“There aren’t many parcels this size left; this is a very important addition to our community,” she said.

However, officials do not view their work as complete.

Town of Brookhaven Councilwoman Valerie M. Cartright, without revealing specifics, said: “We have some key initiatives that are coming up soon.”