
The Housatonic River flows from north to south through a rolling valley between the Taconic Mountain Range of eastern New York State and the Berkshire Hills of western Massachusetts. Eventually it meanders through the state of Connecticut and empties into Long Island Sound. The river flows 69 miles through Massachusetts, starting in Muddy Pond in the Town of Washington. The watershed drains approximately 504 square miles of land in western Massachusetts and eastern New York, and is made up of all or part of 18 municipalities. According to the 1990 census data, the Massachusetts portion of the watershed supports a population of approximately 94,000 people with more than half of the total population residing in the City of Pittsfield. The watershed exhibits variable hydrology, both swift and meandering river segments and streams, productive aquifers, extensive wetland habitat, and approximately 118 lakes and ponds. The calcareous substrate and variability of terrain and climate supports a prolific biological community, including approximately 117 rare plant species, 33 rare animal species, and 18 significant natural biological communities.