In the 18th century the Pequonnock River Valley remained in its natural state as it has been since the last ice age. During the 19th century a strong industrial base will emerge in the Pequonnock Valley and by the end of the 20th century, the valley will return to its natural state with archaeological reamins fading into oblivion. Mill Pond built south of Parlor Rock where Radcliffe's Knit Mill was located on the east side and the Long Hill Saw Mill on the west side. Tungsten Mining Company operated a full scale operation north of Parlor Rock. In the 1900's the valley's industry will vanish and the valley will revert to its original state.
Floods destroy the mills along the river.
Fire destroys the Radcliffe Factory and the mining operations. Parlor Rock closes. The railroad is dismantled as the automobile becomes the machine of the century. The reservoir is drained and the dam destroyed in 1935 after a boy drowns. In 1971 the US Corps of Engineers under took a project to study the feasibility of building a dam and reservior near the site of last centuries site.