2011 Map of Island Park Dam

About this map

Island Park Reservoir dominates this high-country Idaho landscape, where the Henrys Fork river is captured at the Island Park Dam. The geography here is defined by its recreation and ranching heritage, with a network of access points like Jackson Landing Campground and Buttermilk Campground dotting the shoreline. To the north, the small settlement of Rea and the McCrea Ranch sit along the winding river valley below Thurmon Ridge. The map details a complex system of local forest roads, including Yale-Kilgore Rd and Stamp Meadows Rd, which connect the scattered homesteads and seasonal camps. Diverse terrain features such as I P Bills Island, Shotgun Valley, and the dramatic Box Canyon illustrate the unique volcanic and alluvial geology of the Snake River Plain’s northern edge in the early 21st century.