Historic Harrisville is dedicated to protecting critical land parcels in and around the mill village by means of establishing conservation easements or outright purchase.
In 2004, Historic Harrisville purchased the land and former mill sites upstream from Harrisville village. The sites comprised the tiny industrial village known as Mosquitobush, where waterpower turned the machinery for small woodworking mills until the late 1930s. These seven acres lie between Lake Nubanusit and Harrisville Pond. They are a wildlife habitat for otter, moose, weasels, birds, amphibians, and reptiles. The Harris Center for Conservation Education holds a conservation easement on the land.
In 1987 Historic Harrisville established its first conservation easement, 28 acres of privately owned hillside land above the village. They offer a grand view of Mount Monadnock.
Johnson Field Easement
This triangular field, located at the eastern entrance to the mill village, has been owned and protected from development by Historic Harrisville since 1988. In 2010 a community garden was established where 30 plots are under cultivation by individuals.