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1899 Map of Boulder

Name: 1899 Topographic Map of Boulder
Creator: U.S. Geological Survey
Published: 1899
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1899

About this map

Mining operations and early railroad infrastructure define this late nineteenth-century landscape of Jefferson County. The town of Boulder sits as a central hub in the Boulder Valley, supported by the convergence of the Northern Pacific R. R. and the Montana Central R. R. nearby. The mountainous terrain is heavily marked by the region's extractive economy, featuring a dense concentration of named claims such as the Hidden Treasure Mine, Bullion Mine, and Ruby Mine.

Industrial sites like the Amazon Mill and the Yellowstone Placer near Lower Whitetail Park indicate the scale of gold and silver processing during this era. Beyond the industrial corridors, the map traces the early development of recreational and transit landmarks, including Boulder Hot Springs and the Telegraph Road. High-altitude features like Rocker Peak and Whitetail Peak overlook a network of gulches and creeks that fed both the mining camps and the developing valley settlements.