North Pool is a combination of open water and reed and cattail marsh that serves as a puddle duck factory during the breeding season, and when the water levels are left high during spring and summer, also serves as a breeding area for elusive marsh birds. Significant numbers of Gadwalls and Mallards nest in North Pool, as do small numbers of Black Ducks. Wood Ducks, both species of Teal and Northern Shoveler are seen frequently enough in the pool during summer to suspect these species sometimes breed. In recent years North Pool has supported healthy populations of Sora and Virginia Rail, and one or more pairs of Pied-billed Grebe, Least and American Bitterns, King Rail, Common Gallinule, and possibly Coot. 
From A Birders Guide to Parker River National Wildlife Refuge

Refuge Road runs along the east side of North Pool.

Located along the northeast coast of Massachusetts, Parker River National Wildlife Refuge was established in 1941 to provide a feeding, resting, and nesting habitat for migratory birds. Most commonly associated with Plum Island, a barrier beach island, the refuge is comprised of more than 4700 acres of diverse habitats including sandy beach and dune, cranberry bog, maritime forest and shrubland, and freshwater marsh. The most abundant habitat on the refuge is its 3,000+ acres of salt marsh, one of the most productive ecosystems in nature. Parker River provides a pristine coastal habitat for over 300 species of resident and migratory birds, as well as a large variety of mammals, insects, fish, reptiles, and amphibians. The refuge also provides critical habitat for the federally threatened piping plover.

In addition to its mission of wildlife conservation, the refuge provides a variety of excellent wildlife-dependent recreational activities, including surf fishing, wildlife observation and photography, a variety of interpretive programs, and seasonal waterfowl and deer hunting opportunities. A large visitor center, complete with a classroom and auditorium, msupports many of these public uses.

Parker River has achieved the following special designations: Western Hemispheric Shorebird Reserve Network (WHSRN), Important Bird Area (IBA), and Area of Critical Environmental Concern (ACEC).