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Hudson, Middlesex County, Massachusetts, 01749, United States (42.39131 -71.56782)
The Assabet River runs prominently through most of Hudson. The river arises from wetlands in Westborough and flows northeast 34 miles (55 km), starting at an elevation of 320 feet (98 m). It descends through the towns of Northborough, Marlborough, Berlin, Hudson, Stow, Maynard, Acton, and finally Concord, where it merges with the Sudbury River to form the Concord River, at an elevation of 100 feet (30 m). The dam in central Hudson is one of nine historic mill or flood control dams on the Assabet River. A portion of the Assabet River National Wildlife Refuge is located in Hudson.