1970 Map of Dillon

About this map

Silverthorne and Dillon serve as the primary hubs in this high-altitude landscape, documented at a time of significant transition. The map captures the infrastructure supporting the growing recreation and residential economy, including the Dillon Reservoir and the Blue River Ranch Lakes development. While the valley floor shows signs of expansion through features like Mesa Cortina and a Trailer Park, the surrounding high country remains dominated by the Arapaho National Forest and the Eagles Nest Wilderness. This survey highlights the complex drainage system of the Blue River, fed by numerous high-mountain tributaries such as Maryland Creek and Straight Creek. The network of the Gore Range Trail and various pack trails reveals how researchers can trace the movement between the developed valley and the alpine summits of Ptarmigan Peak and Tenderfoot Mountain.