
Dillon serves as the focal point for this expansive 1958 survey, where the Beaverhead River and Big Hole River converge in a landscape defined by the winding Continental Divide. The map captures a critical era of mountain industry and transit, documenting the high-altitude mining operations at the Hecla Mine and Greenstone Mine alongside a dense network of mountain railroads. The Union Pacific and Northern Pacific lines are clearly delineated as they navigate the passes between the Pioneer Mountains and the Ruby Range. This record is particularly valuable for tracing the hydraulic patterns of the region, from the Jefferson River headwaters to remote reaches like Medicine Lodge Creek and Bloody Dick Creek. Smaller settlements such as Wisdom, Twin Bridges, and Argenta are depicted in their mid-century configuration, providing a clear view of the ranching and resource-extraction hubs that anchored Beaverhead and Madison Counties.
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This is the sole edition of this map. No revisions or reprints were ever made.
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