Keystone serves as the focal point for this high-altitude landscape, where the recreation-heavy footprint of the Keystone Ski Area meets the industrial legacies of Summit County's mining past. The terrain is defined by a dense network of gulches and ridges, including Tenderfoot Mountain and Porcupine Peak, which feed the Snake River and Swan River systems. Hidden beneath these peaks, the Harold D Roberts Tunnel represents a massive feat of water engineering, diverting Western Slope water toward the Front Range. Local history is etched into the names of routes and landmarks such as the Hunkidori Mine Trail, Brewery Hill, and the settlement at Tiger. The presence of the Continental Divide National Scenic Trail underscores the area's role as a major alpine thoroughfare, while dozens of specialized trails like the Summit Fat Tire Society Trail reflect its modern evolution into a premier outdoor destination.
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1889 · Leadville
USGS Topo · 1:125,000
1891 · Leadville
USGS Topo · 1:125,000
1924 · Montezuma
USGS Topo · 1:62,500
1926 · Montezuma
USGS Topo · 1:62,500
1929 · Dillon
USGS Topo · 1:62,500
1933 · Montezuma
USGS Topo · 1:62,500
1934 · Climax
USGS Topo · 1:48,000
1934 · Dillon
USGS Topo · 1:62,500
1937 · Como
USGS Topo · 1:62,500
1938 · Mt. Lincoln
USGS Topo · 1:48,000