 The hill and reservation are characterized by steep slopes largely wooded with northern hardwood forest species, particularly eastern hemlock.Petticoat Hill rises nearly above downtown Williamsburg; its subordinate summits include Scott Hill, 1,027 ft (313 m), on which are located the reservation and trails; and Unquomonk Hill, (1,083 ft (330 m).The east and south sides of Petticoat Hill drain into Unquomonk Brook, thence into the Mill River, the Connecticut River, and Long Island Sound.