2017 Map of Earthquake Lake

About this map

Earthquake Lake and the massive Madison Slide dominate this high-elevation landscape along the Madison River canyon. This 2017 survey captures the dramatic topography of the Henrys Lake Mountains where the Continental Divide separates Montana and Idaho. The map reveals the stark contrast between the steep, forested slopes of the Beaverhead National Forest and the lower, open reaches of Missouri Flats. Local ranching and settlement history are reflected in sites like the Continental Divide Ranch and the small cluster at Jensen. The road network, including names like Greased Line Way and Hook and Horn, hints at the area's legacy of fishing and high-country recreation. Numerous watercourses, such as Mile Creek and Deadman Creek, drain the surrounding peaks, including Sheep Mountain and the prominent landmark known as The Horn.