Hayden's Triangulation Map of Colorado, 1877

Hayden's Triangulation Map of Colorado, 1877

From 1867 to 1871, the United States Geological Survey sent Dr. Ferdinand V. Hayden out to map Wyoming and Colorado. Using the tallest peaks, Hayden triangulated the distances between major landmarks, producing the first accurate, detailed maps of Colorado, which became a state in 1876. The Hayden team had to climb many of Colorado's peaks to establish these benchmarks, and so became Colorado's first "Peak Baggers".

The Hayden Survey passed through Boulder in 1869.  Sketches by Henry Elliot, the expedition artist, are some of the earliest images of what our county originally looked like.

Map courtesy of the Honorable Greg Hobbs Collection

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