2020 Map of Earthquake Lake

About this map

Earthquake Lake and the Madison Slide dominate this topography, marking the dramatic geomorphic changes in the Madison River Canyon. The landscape transitions from the high peaks of the Henrys Lake Mountains and Sheep Mountain down to the Missouri Flats, where the Madison River flows westward. Human presence is etched into the terrain via roads like Greased Line Way and the Continental Divide Ranch. The map captures the complex boundary where the Gallatin National Forest, Beaverhead National Forest, and Targhee National Forest converge at the Continental Divide. This intersection of three national forests and the Montana-Idaho state line highlights a region managed for wilderness and grazing, evidenced by cattle-related labels like Sheep Creek Rd and the small settlement at Jensen.