The Hubbard River, 4.6 miles (7.4 km) long, is part of the Farmington River

Farmington River

The Farmington River is a river located in northwest Connecticut, with major tributaries extending into southwest Massachusetts. Via its longest branch , the Farmington's length increases to , making it the Connecticut River's longest tributary by a mere over the major river directly to its...

 watershed. It is a main feature of Granville State Forest

Granville State Forest

Granville State Forest is a Massachusetts state park located in Granville and Tolland in the southern Berkshire Hills along the state's southern border with Connecticut. The park is managed by the Department of Conservation and Recreation...

 where it drops 450 feet (137.2 m) in 2.5 miles (4 km). It is named for Samuel Hubbard, the English colonist who first came to the area in 1749. The river heads in Tolland, Massachusetts

Tolland, Massachusetts

Tolland is a town in Hampden County, Massachusetts, United States. The population was 485 at the 2010 census, making it the smallest town in Hampden County by population. It is part of the Springfield, Massachusetts Metropolitan Statistical Area. Tolland formerly had a popular "Black Fly Day"...

, at the junction of Babcock Brook and Hall Pond Brook, then flows southeast across Granville, Massachusetts

Granville, Massachusetts

Granville is a town in Hampden County, Massachusetts, United States. The population was 1,566 at the 2010 census. It is part of the Springfield, Massachusetts Metropolitan Statistical Area.- History and Description :...

 to Barkhamsted Reservoir in the town of Hartland, Connecticut

Hartland, Connecticut

Hartland is a town in Hartford County, Connecticut, United States. The population was 2,012 at the 2000 census.-Geography:According to the United States Census Bureau, the town has a total area of , of which is land and is water...

.