How far north do the tides go in the Hudson River?

The official source of the Hudson is Lake Tear of the Clouds in the Adirondack Mountains. However, the waterway from the lake is known as Feldspar Brook and the Opalescent River, feeding into the Hudson at Tahawus. The actual Hudson River begins several miles north of Tahawus at Henderson Lake. The Hudson is joined at Troy (north of Albany) by the Mohawk River, its major tributary, just south of which the Federal Dam separates the Upper Hudson River Valley from the Lower Hudson River Valley or simply the Hudson River Valley. South of Troy, the Hudson widens and flows south into the Atlantic Ocean between Manhattan Island and New Jersey, forming New York Harbor, at New York Bay, an arm of the Ocean. The Hudson was originally named the "North River" by the Dutch, because the river was the major route north. It was the English who originated the Hudson name, even though Hudson had found the river while exploring for the Dutch.