Water District Drinking Water Source
Cocheco River Watershed
Blackwater Brook crosses into Somersworth from Rochester, near a parking lot on Whitehouse Road. It runs through a three quarter mile stretch of forest, and then passes several homes on Old Rochester Dover Road. The brook crosses this road, and passes several more houses on Blackwater Road. It then passes through a culvert under the road, and crosses into Dover on its way to join the Cocheco River.
Twombly Brook flows out of a small forested wetland on Somersworth’s southern border with Rollinsford, east of Green Street. It runs along the edge of a large lawn and then crosses into Rollinsford.
Salmon Falls River Watershed
Willand Pond lies at the southern tip of Somersworth, in a densely developed area along High Street. It sits on Somersworth’s border with Dover, and is mostly surrounded by buildings, roads, and parking lots. The north shore of the pond is forested, and here a small stream flows north, through dense residential development along Blackwater Road. The stream runs through a small emergent wetland, east of Somersworth center, and then joins Tates Brook near a school on West High Street. This brook passes under the street and crosses a large farm field, where it spreads out in an area of beaver activity. It then flows past a few homes and through a culvert on Rocky Hill Road. Tates Brook forms a small pond on the edge of a large farm, as it backs up behind a bridge on the New Hampshire Northcoast Railroad tracks, and then joins the Salmon Falls River.
Lily Pond is located in northern Somersworth, surrounded by homes on Coles Pond Prow and Lily Pond Road. A small stream flows out of the north end of the pond, and makes its way through a half mile of forest, until it meets the New Hampshire Northcoast Railroad tracks near a small gravel pit. The stream then passes under the tracks and flows through another half mile of forest to meet the Salmon Falls River.
The Salmon Falls River forms Somersworth’s eastern border with Maine. It flows over an old dam and passes through a low density residential area along Salmon Falls Road. The river passes under a bridge on Salmon Falls Road and flows past two large farms and a half mile of forested wetland, before it reaches an area of dense development across from Berwick, Maine. Here the New Hampshire Northcoast Railroad tracks run along the rivers edge, as it passes over two dams at the General Electric Company hydro power facility on Main Street. The river continues to encounter dense development as it pools behind a third dam on Buffumsville Road, and then passes the Somersworth Wastewater Treatment Plant. The Salmon Falls River winds around a small forested hill and then crosses into Rollinsford.