More information about the Blackall Family Preserve on ExploreRI.org. Directions: The Preserve is located in the Cumberland Hill area.  From 295, take the exit for Rt 122 and turn right to head north. Travel 2.5 miles to the intersection with Manville Hill Road (light). Proceed straight to next light and turn right onto West Wrentham Road.  Travel about .6 miles. The public access to the Preserve is located on the left just below Old Wrentham Road with roadside parking available.