The South Branch of the Sugar River is a 6.6-mile-long (10.6 km)  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.
The South Branch begins at the confluence of Gunnison Brook and Blood Brook at the center of the town of Goshen, New Hampshire. The river flows north, reaching the Sugar River near the center of the town of Newport. New Hampshire Route 10 follows the South Branch for its entire length.
- New Hampshire GRANIT state geographic information system Archived 2013-08-03 at the Wayback Machine.
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