1Choose Your Watershed
 Use the map below to choose a watershed...
or go to 'My Plans' to resume work on an existing plan.
Use the slider or select a town to view waterbodies on the map. Choose your watershed by clicking on the waterbody, then click "Next Step". Tip: Click directly on lakes/ponds and MS4 regulated areas. For rivers, click the most downstream segment that you want included in your watershed. This will select the MassDEP sub-basin (purple boundary lines) that your river segment is within, and all areas that drain to it. If the selected sub-basin results in a larger watershed than intended (due to significant downstream areas and receiving waters within the sub-basin), try selecting the adjacent upstream sub-basin.
 What type of watershed are you interested in?
 Lakes & Ponds Rivers & Streams MS4 Area