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1970 Map of Dillon

Name: 1970 Topographic Map of Dillon
Creator: U.S. Geological Survey
Published: 1973
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1973

About this map

The Blue River valley serves as the central artery for this 1970 landscape, where the growing towns of Silverthorne and Dillon are captured during a period of significant water-management transformation. The southern portion of the map is dominated by the Dillon Reservoir, with its modern Boat Ramp and nearby Ranger Station signaling its role as a regional recreational hub. This survey illustrates the proximity of residential and infrastructure expansion, such as the Trailer Park and Sewage Disposal sites, against the permanent boundary of the Arapaho National Forest.

To the east, the Williams Fork Mountains rise sharply, marked by high-altitude features like Ptarmigan Peak and Ptarmigan Pass. The terrain is crisscrossed by historic routes including the Dillon Jeep Trail and various Pack Trails, which contrast with the industrial presence of Gravel Pits along the river. These details provide a clear view of how high-country wilderness and mid-century utility coexisted in this part of Summit County.