1899 Map of Boulder

About this map

Boulder serves as the focal point of this late 19th-century Montana landscape, where the Montana Central R. R. and the Northern Pacific R. R. Elkhorn Branch converge in the Boulder Valley. The region is defined by an intensive mining economy, with dozens of active operations such as the Hidden Treasure Mine, Mina Mine, and Frohner Mine peppering the surrounding peaks. This survey captures a specific industrial moment when the Amazon Mill operated alongside early recreation sites like Boulder Hot Springs. High-altitude placer mining is evident at Penn Placer and Yellowstone Placer, indicating the diversity of extraction methods used across the Helena National Forest and Deerlodge National Forest. Significant transportation hubs like Basin and Wickes anchor the rail lines, while the Butte Hospital marks the edge of expanding social infrastructure in the southwest.