Stony Brook (Souhegan River tributary)

Stony Brook
Stony Brook near its mouth in Wilton, NH
Location
CountryUnited States
StateNew Hampshire
CountyHillsborough
TownsGreenfield, Lyndeborough, Wilton
Physical characteristics
SourceLyndeborough Mountain
  locationLyndeborough
  coordinates42°55′14″N 71°48′19″W / 42.92056°N 71.80528°W / 42.92056; -71.80528
  elevation1,270 ft (390 m)
MouthSouhegan River
  location
Wilton
  coordinates
42°50′39″N 71°44′20″W / 42.84417°N 71.73889°W / 42.84417; -71.73889
  elevation
338 ft (103 m)
Length10.6 mi (17.1 km)

Stony Brook is a 10.6-mile-long (17.1 km) river located in southern New Hampshire in the United States. It is a tributary of the Souhegan River, which flows to the Merrimack River and ultimately to the Gulf of Maine.

Stony Brook rises in the town of Lyndeborough, New Hampshire, in a valley between Lyndeborough Mountain to the north and Winn Mountain to the south. It flows west into the town of Greenfield, then turns southeast and reenters Lyndeborough, continuing to the Souhegan in the mill town of Wilton.

It is paralleled from Greenfield to Wilton by New Hampshire Route 31 and by the former Hillsboro Branch of the Boston and Maine Railroad.