Bison Mountain and the Continental Divide dominate this high-altitude landscape within the Helena National Forest and Deerlodge National Forest. This section of the Montana Rockies is defined by a dense network of gulches and watercourses, including the Little Blackfoot River, Ontario Cr, and Sawmill Cr. A legacy of resource extraction is visible at the Irish Mine near Irish Hill, where local mining history meets the steep terrain of Baldy Ridge.
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This is the sole edition of this map. No revisions or reprints were ever made.
1889 · Helena
USGS Topo · 1:250,000
1893 · Helena
USGS Topo · 1:250,000
1899 · Boulder
USGS Topo · 1:125,000
1899 · Helena
USGS Topo · 1:250,000
1903 · Helena
USGS Topo · 1:250,000
1947 · Butte
USGS Topo · 1:250,000
1954 · Basin
USGS Topo · 1:62,500
1958 · Butte
USGS Topo · 1:250,000
1958 · Avon
USGS Topo · 1:62,500
1959 · Deer Lodge
USGS Topo · 1:62,500