Southside Brook

The Southside Brook Watershed occurs in eastern York and Kittery, and includes small coastal drainages between the York and Piscataqua Rivers. The most significant of these drainages is Brave Boat Harbor, a large estuary that forms part of the border between York and Kittery.


Drainage: 3.85 square miles
Drinking water source for: None
Receives wastewater from: None
Significant water features: Brave Boat Harbor, Seapoint Beach

Watershed Description

There is relatively little development within the Southside Brook watershed, owing to the fact that a large percentage is part of the Rachel Carson National Wildlife Refuge. Additionally, the the estuary at Brave Boat Harbor creates a wide wetland and there exist coastal communities at Seapoint Beach. Otherwise, the watershed consists mostly of large forested blocks and agricultural lands. Because of these factors, several areas of the watershed provide significant habitat for waterfowl, wading birds, and rare and endangered species, including the endangered New England Cottontail and the Saltmarsh Sharp-Tailed Swallow.   

Local Information

Towns in Watershed

Kittery, York

Mt. Agamenticus to the Sea Conservation Initiative

Ten organizations began working together on the Mt. Agamenticus to the Sea Conservation Initiative (MtA2C) in 2002 to conserve the most important forests, fields, wetlands and marshes in a region that includes part of Kittery, Eliot, York, Ogunquit, Wells, and South Berwick. Their goal is to conserve and protect 19,000 acres of natural lands and watersheds in the Mt. Agamenticus region to benefit people and wildlife.

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