
The Parker River Watershed is located in the northeast corner of the state, nestled between the Merrimack River Watershed to the north and the Ipswich River Watershed to the south. It has a total drainage area of approximately 82 square miles and encompasses all or part of nine municipalities, including the City of Newburyport. The Parker River originates at the confluence of two unnamed brooks located in the wetlands near Main Street in West Boxford. Once formed, the Parker River meanders approximately 21 miles through a rolling landscape before emptying into Plum Island Sound at the Parker River National Wildlife Refuge. The Parker River feeds approximately nine major tributaries, including the Mill River, Ox Pasture Brook, Little River, Penn Brook, Jackman Brook, Wheeler Brook, Bachelder Brook, Beaver Brook, and the Rowley River. The watershed also includes fourteen lakes and ponds, covering approximately 295 acres of the watershed.
Approximately half of the area within the watershed is protected open space or used for recreation, such as the Parker River National Wildlife Refuge. The refuge is operated and maintained by the U.S. Fish and Wildlife Service under the Department of the Interior. The 4662-acre refuge contains a coastal barrier beach and offers a variety of wildlife habitats, such as freshwater wetlands and salt marshes. The refuge also lies within the Atlantic Flyway, an important corridor for migratory waterfowl.