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New York - 600 feet
At 600 feet of sea level rise, Lake Ontario would be flooded by the Atlantic Ocean through the Hudson River cutting straight through from Schenectady to Utica following Interstate 90, flooding both towns. Most of Interstate 81 and 90 near Lake Ontario are underwater including Rochester. The Hudson River’s banks would widen further from Troy south. The two largest of New York’s Finger Lakes; Seneca and Cayuga Lakes, would now be inlets of Lake Ontario. The Niagara Falls would cease to exist since Lake Erie is at 571 feet above sea level meaning this is the point at which Lake Ontario and Erie start becoming one large lake.

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