Investigate our Watershed, trails, and water sampling sites.

The Neponset Watershed contains 120 square miles of forests, trails, and parks; dozens of streams and ponds; and of course, the 29-mile Neponset River, its estuary and salt marsh.

The Watershed includes parts of 14 cities and towns: Boston (Hyde Park, Mattapan, and Dorchester), Canton, Dedham, Dover, Foxborough, Medfield, Milton, Norwood, Quincy, Randolph, Sharon, Stoughton, Walpole, and Westwood.

Maps & Guides

Neponset River Watershed. Click for a larger view.
Aerial view of Neponset River Estuary and Gulliver’s Creek.
Neponset Map_1876_“Map reproduction courtesy of the Norman B. Leventhal Map & Education Center at the Boston Public Library”. Click for a larger view.

Data Maps

Our data maps allow us to track water quality and habitat restoration in the Neponset Watershed.

Please email NepRWA River Restoration Director, Sean McCanty, with any questions or comments.

Click below to view the maps.

Water Quality Data Map from the Community Water Monitoring Network (CWMN)

NepRWA’s volunteer CWMN program, which began in 1995, allows us to collect samples from 41 sites across the Watershed. We monitor E. coli, Total Phosphorus, Total Nitrogen, pH, Dissolved Oxygen, Ammonia, Temperature, and Chlorophyll A.

Native Trout Restoration Map (Part of the Greater Boston Trout Unlimited “Embrace a Stream” Project)

We have partnered with Greater Boston Trout Unlimited (GBTU) in an effort to save the Neponset River’s native brook trout. The project, called “Embrace a Stream,” provides much-needed information to assess past and future restoration activities and to prioritize future projects.