Construction on the backbone trail began in the early 1980s, and involved the cooperation of the National Park Service, the California Department of Parks and Recreation, and private parties interested in connecting existing trails within the Santa Monica Mountains NRA into a single trail spanning the length of the park. The range of conditions found on the trail - ranging from flat, wide fire roads to narrow single-track trails - reflects the trail's origin as a series of unconnected paths and backcountry roads, connected to form the Backbone Trail System.