
Mammoth sits at the nexus of several mountain drainages in this high-altitude landscape of Madison County. The terrain is defined by the Tobacco Root Mountains, where sharp elevation changes create dramatic features like Hells Hole and Manhead Mtn. This area serves as a significant watershed, feeding the South Boulder River through a network of creeks including Cataract Creek and McGovern Creek. High alpine waters such as Rock Cr Lake, Beall Lake, and Curly Lake are tucked into the glacial cirques and valleys of the Deerlodge National Forest and Beaverhead National Forest. Evidence of the region's historical labor remains at the Old Miners Cabin, located along the route of S Boulder Rd, reflecting the era when prospecting and timber extraction drove the local economy in these isolated canyons.
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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 · Jefferson Island
USGS Topo · 1:62,500
1950 · Harrison
USGS Topo · 1:62,500
1955 · Bozeman
USGS Topo · 1:250,000
1955 · Dillon
USGS Topo · 1:250,000