2018 Map of Ackerson Mountain

About this map

Aspen Valley and the high Sierra Nevada meadows serve as central landmarks in this documentation of the borderlands between Stanislaus National Forest and Yosemite National Park. The landscape is defined by its drainage basins, where the Middle Tuolumne River and the S Fork Tuolumne River cut through steep terrain near Ackerson Mtn. Historical transit corridors are well-represented, showing the winding path of the Old Tioga Road and the Old Big Oak Flat Road (Gentry Rd) as they move through high-altitude clearings like Crane Flat and Gin Flat. These roads and trails, including the S Fork Tuolumne River Trail, trace the legacy of early access to the California high country. The map also captures the transition from Tuolumne into Mariposa County, specifically along Crocker Ridge, offering a clear view of the wilderness interface that remains critical for modern conservation and resource management.