1975 Map of Canyon Ferry Dam

About this map

The Missouri River corridor serves as the central artery of this region, dominated by the massive waters of Canyon Ferry Lake and Hauser Lake. This mid-1970s survey captures the landscape during a period of established hydroelectric development, anchored by the Canyon Ferry Dam and Hauser Dam. Industrial and transit hubs such as East Helena and Montana City show the area's growth, supported by the Burlington Northern railroad lines. To the east, the Big Belt Mountains rise sharply, dotted with mining history at the Schabert Mine and Humming Bird Mine. The map also delineates the protected expanse of the Gates of the Mountains Wilderness Area, where the river cuts through high limestone cliffs north of Upper Holter Lake. From the small settlement of York to the Helena Valley Regulating Reservoir, the sheet reveals the complex management of water and minerals in the Montana interior.