Salmon Brook is one of the six major tributaries of the Merrimack River in northeastern Massachusetts in the United States. Its watershed is and is one of the 14 subwatersheds of the Merrimack River. It passes through Dunstable, Massachusetts, and

Nashua, New Hampshire Nashua is a city in southern New Hampshire, United States. At the 2020 United States census, 2020 census, it had a population of 91,322, the second-largest in northern New England after nearby Manchester, New Hampshire, Manchester. Along with Manc ...

Route description

Salmon Brook begins at the outlet of Lower Massapoag Pond near the center of Dunstable. It then flows approximately north-northeast to the Merrimack River. The water body farthest upstream in the watershed is Martins Pond just east of the center of the town of Groton. The outlet, Martins Pond Brook, runs southeast to Lost Lake/

Knops Pond Knops Pond is a lake in Middlesex County, in the U.S. state of Massachusetts. Knops Pond was named after James Knapp (or Knop), a pioneer citizen. See also *Lost Lake (Groton) Lost Lake, also known as Knop/p/s Pond, is a reservoir in Groton, ...

, the start of a chain of lakes that includes Whitney Pond, Cow Pond, and Upper and Lower Massapoag ponds. All of these water bodies are dammed. Salmon Brook runs roughly parallel to the Nashua River for its entire course from Lower Massapoag Pond to the Merrimack River.

References

Tributaries of the Merrimack River Rivers of Middlesex County, Massachusetts Rivers of New Hampshire Nashua, New Hampshire Rivers of Massachusetts Rivers of Hillsborough County, New Hampshire {{Massachusetts-river-stub