The Souhegan River
is about 35 miles long. It flows north from Massachusetts
into New Hampshire
and then east to a confluence with the Merrimack River
, passing through a half-dozen towns, including the center of Milford
The river is used for water supplies, hydropower, and recreation. There are 28 threatened or endangered species sharing the watershed with 35,000 people. It is part of the New Hampshire Rivers Management Protection Program.