
Central City and the surrounding mining districts of Gilpin County define this high-altitude landscape during the early 20th century. High-density settlement is evident at Nevadaville and Russell Gulch, while the presence of the Bald Mountain P.O. and Boulder County Mine underscores the intense extraction activity that shaped these mountains. The Continental Divide bisects the western reaches, with the Denver Northwestern and Pacific RR engineering its way through Rollins Pass and passing notable landmarks like Yankee Doodle Lake and the Riflesight Notch. Along the eastern slopes, small camps and towns such as Rollinsville, Eldora, and Nederland serve as gateways to the high country. In the north, the historic silver-mining area near Caribou Hill and Caribou Park illustrates the northern extent of the mineral belt. To the south, the Colorado Southern RR corridor follows the valley through Dumont, Lawson, and Empire, connecting these camps to the broader regional economy.
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1899 · West Denver
USGS Topo · 1:125,000
1902 · Boulder
USGS Topo · 1:62,500
1903 · Georgetown
USGS Topo · 1:62,500
1904 · Boulder
USGS Topo · 1:62,500
1905 · Georgetown
USGS Topo · 1:62,500
1906 · Blackhawk
USGS Topo · 1:62,500
1910 · Central City
USGS Topo · 1:62,500
1912 · Central City
USGS Topo · 1:62,500
1915 · Longs Peak
USGS Topo · 1:125,000
1919 · Rocky Mountain National Park
USGS Topo · 1:125,000