Partridge Brook is a 7.5 mile long (12.1 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 southwestern 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 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...

, which flows to 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...

.

Partridge Brook begins at the outlet of Spofford Lake

Spofford Lake

Spofford Lake is a water body located in Cheshire County in southwestern New Hampshire, in the town of Chesterfield. Water from Spofford Lake flows via Partridge Brook to the Connecticut River. In 2005 the NH Department of Fish and Game named it the cleanest lake in southwestern New Hampshire,...

 in the town of Chesterfield, New Hampshire

Chesterfield, New Hampshire

Chesterfield is a town in Cheshire County, New Hampshire, United States. The population was 3,604 at the 2010 census. It includes the village of Spofford...

. The brook flows east, then north, then northwest, into the town of Westmoreland

Westmoreland, New Hampshire

Westmoreland is a town in Cheshire County, New Hampshire, United States. The population was 1,874 at the 2010 census. Westmoreland is historically an agricultural town, with much arable farmland.-History:...

, before reaching the Connecticut River.

In Westmoreland, the brook is subject to New Hampshire's Comprehensive Shoreland Protection Act.