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1904 Map of Boulder

Name: 1904 Topographic Map of Boulder
Creator: U.S. Geological Survey
Published: 1947
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1947

About this map

Gold mining operations and mountain settlements define the landscape of Boulder County during the early twentieth century. Steep canyons carved by South St. Vrain Creek and Left Hand Creek host a dense network of mining camps and railroad spurs. The Colorado and Northwestern RR winds through the hills, connecting the city of Boulder to the high-elevation mining districts of Gold Hill and Sunset.

High-altitude outposts such as Balarat, Wallstreet, and Jamestown are mapped alongside specialized engineering works like the Golden Rule Mining Co. Ditch. These labels reveal an era of intense resource extraction where every ridge and gulch was named, from Porphyry Mt. to Emancipation Hill. The map also captures the early footprint of the Rocky Mtn. Nat. Park boundary, illustrating the transition from industrial mining to the preservation of the Front Range.