The Sunapee Mountain ridgeline creates a divide between two watersheds: One flows into the Merrimack River while the other flows into the Connecticut River. View the watersheds and their rivers and brooks with the following maps:
Connecticut River Basin via the Connecticut River Conservancy.
Story Map of the Lake Sunapee Watershed via the Lake Sunapee Protective Association. The Story Map shows the sub-watersheds, as well.
Natural Resources Map for Goshen (pdf) that shows Gunnison Brook, the South Branch of the Sugar River, and Cherry Brook.
Gunnison Lake (pdf) in Goshen. Published by New Hampshire Fish and Game, this map shows Blood and Baker brooks.
Sunapee Mountain brooks
Starting on the east side of the mountain: The highlands along the southerly ridge drain to the West Branch of the Warner River that flows into the Warner River, and then into the Contoocook River and Merrimack River. Andrew Brook is a tributary of the Warner River.
The mountain’s northern and western lands drain to the Connecticut River. Johnson Brook comes off the north slopes and enters Chandler Brook along the Beach Access Road, and Beck Brook flows off the mountain into Chandler Brook, as well.
Chandler Brook flows into Lake Sunapee near the state beach. And the outlet to Lake Sunapee, at Sunapee Harbor, flows into the Sugar River and west to the Connecticut River.
Gunnison Brook and Blood Brook flow to the South Branch of the Sugar River. And at the southwestern end of Sunapee Mountain, along the Pillsbury-Sunapee Highlands, Cherry Brook feeds the headwaters of the Ashuelot River. The Ashuelot Rivers flows into the Connecticut River near the Massachusetts border.