The Hoosic River is a tributary of the Hudson River, 70 miles (113 km ) long, in the northeastern United States. It rises in northwestern Massachusetts in the Hoosac Range. It flows north, west, and northwest, past the Massachusetts towns of Adams, North Adams, and Williamstown, and then across the southwest corner of Vermont, before entering New York. It flows past Hoosick Falls, New York, where it provides hydroelectric power and joins the Hudson 14 mi (23 km) above the city of Troy, New York.
It is not a river in the truest sense of the word, but a river valley into which the ocean water has been admitted by subsidence of the land, transforming a large part of the valley into an inlet, and thus opening it up to navigation.
From Troy to the mouth of the Hudson the river is tidal, and from this point also the river is navigable, not because of the river water itself, but because of the low grade of the river bed by which the tide is able to back up the wat sufficiently to float good-sized boats.
Along the immediate banks of the river are great beds of clay which is extensively used in the manufacture of brick; and the brick-burning plants and huge ice houses are conspicuous features in the landscape.
Enters HoosicRiver from the northeast on the northeast shore of P 1115c, 0.6 mile west of the hamlet of Buskirk.
Enters HoosicRiver from the north 2.0 miles southeast of the hamlet of South Cambridge and 0.2 mile northwest of the hamlet of Buskirk.
Enter HoosicRiver from the north, south and northeast 0.3 and 1.5 miles upstream from highway bridge at the hamlet of Buskirk, and 1.2 and 2.4 miles downstream from highway bridge on Route NY 67 at the hamlet of Eagle Bridge.