Now part of the Palisades Interstate Park Commission, the area was saved in the early 1900s as development along the river began to destroy much of the area's natural beauty.

Numerous efforts were made at the turn of the century to turn much of the Hudson Highlands, the area along the Hudson River from about Peekskill to Newburgh, to a forest preserve. All of these, however, were unsuccessful until the state of New York tried to relocate Sing Sing Prison to Bear Mountain. It was then that some of the wealthy businessmen who had made homes in the area went to work.

Led by Union Pacific railroad president E.W. Harriman, a group of wealthy and influential businessman donated land as well as large sums of money for the purchase of other properties in the area. Bear Mountain-Harriman State Park became a reality in 1910. By 1914, estimates showed more than a million people a year coming to the park. Camping became popular here, with the average stay logged at eight days, and it was a favorite for Boy Scouts.

Harriman-Bear Mountain State Park remains popular today, welcoming more visitors every year than Yellowstone National Park.