2020 Map of Tumble Mountain

About this map

The W Fork Stillwater River carves through the high elevations of Custer National Forest and Gallatin National Forest along the border of Sweet Grass and Stillwater counties. This alpine environment is defined by its dramatic relief, where Tumble Mtn and Chalice Peak overlook a dense concentration of high-mountain lakes. The drainage pattern is complex, with Lightning Cr and Tumble Cr feeding into the main river fork. The landscape is dotted with creatively named water bodies, including Lake Vengeance, Trouble Lake, and Lake Surrender, suggesting the difficult nature of the terrain for early travelers and surveyors. Near the Lake Plateau, several smaller basins like Lake Diaphanous and Lake Pinchot are tucked between ridges, illustrating the glacial character of this wilderness area.