- Map and downloadable files to locate watersheds by region.
- The Blackstone River Watershed encompasses all or part of 29 communities in south central Massachusetts and Rhode Island.
- The Boston Harbor Watershed, encompassing approximately 293 square miles of land area, including all or part of 45 municipalities, as well as most of downtown Boston, is located in and around historic Boston Harbor.
- Buzzards Bay is a moderately large estuary located in southeastern Massachusetts between the western-most portion of Cape Cod and Narragansett Bay in Rhode Island.
- Extending 70 miles into the Atlantic Ocean, the Cape Cod Watershed is surrounded by the salt waters of Buzzards Bay, Cape Cod Bay, the Atlantic Ocean, and Nantucket Sound.
- The Charles River Watershed has a drainage area of approximately 308 square miles and encompasses all or part of 35 municipalities.
- The Chicopee River Watershed drains more than 720 square miles of central Massachusetts before joining the Connecticut River in the City of Chicopee.
- The Connecticut River Watershed is the largest river ecosystem in New England, spanning over four New England states.
- The Deerfield River, with its drainage area of approximately 665 square miles, is one of the coldest and cleanest rivers in Massachusetts.
- This picturesque mountain stream flows southerly for 18 miles through the Berkshires on its way to the mighty Connecticut River Valley.
- The French & Quinebaug Watersheds and the Quinebaug-Shetucket River Valley form the Thames River Watershed.
- 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.
- The Hudson River Watershed of Massachusetts includes three distinct drainage basins covering a total of about 240 square miles.
- Located in northeastern Massachusetts, the Ipswich River Watershed encompasses approximately 155 square miles of land and includes all or part of 21 communities.
- The Island of Martha's Vineyard, located off the southwest shore of Cape Cod, represents one of the two major island watersheds in Massachusetts.
- The main branch of the greater Merrimack River is formed in central New Hampshire by the confluence of the Pemigewasset and Winnipesaukee Rivers.
- The Millers River is located in north central Massachusetts, with approximately 20 percent of the watershed extending into the southern section of New Hampshire.
- The Island of Nantucket lies twenty-five miles south of Cape Cod and fifteen miles east of the Island of Martha's Vineyard, receives most of its fresh water from precipitation
- The Mount Hope Bay Shores and Narragansett Bay Watershed is located in southeastern Massachusetts and a small portion of eastern Rhode Island.
- The Nashua River Watershed has unusual characteristics; once a glacial lake that flowed southward through the Worcester area, its direction reversed forming the Nashua River Valley as a result of Pleistocene glaciation.
- The North Coastal Watershed has a total drainage area of approximately 168 square miles. It encompasses all or part of five river sub-basins, including the Danvers, Essex, Saugus, Pines, and Annisquam Rivers.
- The Parker River Watershed is located in the northeast corner of the state, nestled between the Merrimack River Watershed to the north and the Ipswich River Watershed to the south.
- The Shawsheen River Watershed is located in northeastern Massachusetts with a total drainage area of approximately 78 square miles, including approximately 60 miles of named rivers and streams.
- The South Coastal Watersheds consist of 14 coastal river watersheds with a total drainage area of approximately 240.7 square miles including the North and South Rivers, the Jones River, and the Gulf/Bound Brook.
- The Sudbury-Assabet-Concord Watershed, located in the metro-west area of the state, encompasses a large network of tributaries that ultimately flow into the Merrimack River.
- The Taunton River Watershed is the second largest watershed in the state at 562 square miles. It contains 94 square miles of wetlands, including the largest in the state, Hockomock Swamp, as well as 221 lakes or ponds.
- The Ten Mile River Watershed is located in southeastern Massachusetts and a small portion of northeastern Rhode Island. It is the smallest of the 27 major watersheds in Massachusetts with a total drainage area of approximately 54 square miles.
- The Westfield River Watershed covers over 330,000 acres of land beginning along the eastern slopes of the Berkshires, flowing southward through both rural forested communities and urban centers, ending in the Connecticut River in Agawam.
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