1958 Map of Keystone

About this map

Keystone Mountain and the high ridges of the Arapaho National Forest dominate this mid-century survey, capturing a landscape defined by its mining heritage and water infrastructure. The map documents a significant era of hydraulic engineering, specifically the Roberts Diversion Tunnel and associated ditch systems used by the Denver Municipal Water Works. In the valleys, the small settlement of Keystone sits near the confluence of the Snake River and Soda Creek, while the higher elevations are dotted with historic mining sites like the Saints John Mine and Hunkidori Mine. These lode claims, along with settlements such as Saints John and Swandyke, represent the late-19th-century silver and gold rush legacy that shaped Summit County. The terrain is marked by deep glacial drainages, including Keystone Gulch and Muggins Gulch, which served as the primary corridors for early transportation and resource extraction.