The Palisades Interstate Park Commission purchased its first parcel of what was to become Rockland Lake State Park in 1958, which consisted of the lake and 225 acres (0.91 km2) of land. By 1964, a total of 1,035 acres (4.19 km2) had been purchased to form the park. During the intervening years, additional land acquisitions increased the park's size to its current total of 1,133 acres (4.59 km2).[1]