The lowland portion lies in the Spencer Brook valley, an important Carlisle resource. The Spencer Brook watershed is rich in wildlife such as deer, muskrat, raccoon, fox, coyote, and beaver. Resident and migratory birds include warblers, vireos, hawks, partridge, pheasants, wild turkeys, and ducks, which thrive in this wetland habitat. The sandy banks of Spencer Brook provide nesting for several species of turtles. The woods are pine and mixed hardwood and the vegetation bordering the wetlands includes willow, fern, high bush blueberry, and sweet pepper bush.

Carlisle Conservation Commission leases agricultural use of the land to a local farmer who mows the hay and tends the fields. The bluebird houses are a recent addition.

The Spencer Brook Reservation at the south end of West Street is largely a wetland with some lovely fields. It is owned and managed by the Carlisle Conservation Foundation and was purchased for the preservation of native wildlife.

The CarlisleTrekker website has a description and map of a hike at Spencer Brook Reservation.