Stocker Brook is a 2.9 mile long (4.7 km) stream

Stream

A stream is a body of water with a current, confined within a bed and stream banks. Depending on its locale or certain characteristics, a stream may be referred to as a branch, brook, beck, burn, creek, "crick", gill , kill, lick, rill, river, syke, bayou, rivulet, streamage, wash, run or...

 located in western New Hampshire

New Hampshire

New Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. It is a tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the North Branch

North Branch Sugar River

The North Branch of the Sugar River is a 10.1 mile long river located in western New Hampshire in the United States. It is a tributary of the Sugar River, which flows to the Connecticut River, which flows to Long Island Sound....

 of the Sugar River

Sugar River (New Hampshire)

The Sugar River is a 27.0 mile long river located in western New Hampshire in the United States. It is a tributary of the Connecticut River, which flows to Long Island Sound....

, part of the Connecticut River

Connecticut River

The Connecticut River is the largest and longest river in New England, and also an American Heritage River. It flows roughly south, starting from the Fourth Connecticut Lake in New Hampshire. After flowing through the remaining Connecticut Lakes and Lake Francis, it defines the border between the...

 and Long Island Sound

Long Island Sound

Long Island Sound is an estuary of the Atlantic Ocean, located in the United States between Connecticut to the north and Long Island, New York to the south. The mouth of the Connecticut River at Old Saybrook, Connecticut, empties into the sound. On its western end the sound is bounded by the Bronx...

 drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

.

The brook begins at Cranberry Pond in the town of Croydon, New Hampshire

Croydon, New Hampshire

Croydon is a town in Sullivan County, New Hampshire, United States. The population was 764 at the 2010 census.- History :Incorporated in 1763, the town takes its name from Croydon, a suburb of London, England.- Geography :...

 and flows north, through Stocker Pond, to a junction with Bog Brook in the town of Grantham

Grantham, New Hampshire

Grantham is a town in Sullivan County, New Hampshire, United States. The population was 2,985 at the 2010 census. This made Grantham the fastest growing town numerically in Sullivan County between the 2000 and 2010 censuses...

. The brook turns west and reaches the North Branch of the Sugar River after another mile. Stocker Brook is subject to the New Hampshire Comprehensive Shoreland Protection Act for the portion downstream of Bog Brook.