The Tobacco Root Mountains dominate this high-elevation landscape within the Beaverhead National Forest, where a concentration of geothermal activity is found at Potosi Hot Springs. This natural feature, surrounded by numbered springs like 02S02W07CAB_01 Spring, serves as a focal point for the drainage systems of Potosi Cr and Rock Cr. To the west, the massif includes Potosi Peak and Horse Mtn, creating a high alpine basin filled with glacial lakes such as Hollow Top Lake, Albro Lake, and Deep Lake.
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1888 · Three Forks
USGS Topo · 1:250,000
1893 · Dillon
USGS Topo · 1:250,000
1894 · Three Forks
USGS Topo · 1:250,000
1895 · Three Forks
USGS Topo · 1:250,000
1947 · Bozeman
USGS Topo · 1:250,000
1948 · Bozeman
USGS Topo · 1:250,000
1950 · Harrison
USGS Topo · 1:62,500
1950 · Virginia City
USGS Topo · 1:62,500
1955 · Bozeman
USGS Topo · 1:250,000
1955 · Dillon
USGS Topo · 1:250,000