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1965 Map of Eldorado Springs

Name: 1965 Topographic Map of Eldorado Springs
Creator: U.S. Geological Survey
Published: 1967
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1967

About this map

Eldorado Springs serves as the focal point for this mid-1960s study, situated where the dramatic verticality of The Flatirons meets the plains. The landscape is defined by the steep descent of South Boulder Creek and the intricate path of the Denver and Rio Grande Western railroad as it winds through Rainbow Cut and past Crescent Village. This era showcases the post-war infrastructure of the Front Range, including the Gross Reservoir and the expansive facilities of the National Bureau of Standards on the southern edge of Boulder.

Local history details are abundant, from the small mountain settlements of Magnolia and Twin Spruce to the isolated Chapel in the Hills along Coal Creek. Surveyors meticulously documented the complex water management system of the day, including the South Boulder Diversion Canal and irrigation features like the Community Ditch. High peaks such as Bear Peak and South Boulder Peak dominate the central topography, providing a clear record of the area's transition from high-altitude wilderness to suburban and industrial development.