Whitehall State Park in Hopkinton, Massachusetts, is centered on the former Whitehall Reservoir and is managed by the Department of Conservation and Recreation. The park is used for fishing, boating, and hiking. It was created in 1947 after the reservoir was removed from service as a water source for the Greater Boston area. Its significance lies in that transition, as the landscape changed from a utilitarian water-supply property into a public recreation area.