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1926 Map of Boulder Canyon
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1926 Map of Boulder Canyon

USGS Topo · Published 1926

About this map

Boulder Canyon Dam Site and the proposed Hoover Dam Site represent a critical moment in the history of the American Southwest, appearing here just years before construction began. This survey by the City of Los Angeles focuses on the drainage and topography of the Colorado River and the emerging Lake Mead basin along the Nevada-Arizona border. The map documents the arid terrain of Bitter Spring Valley and Dry Lake Valley, punctuated by landmarks like Muddy Pk and Fortification Hill. Inland, the Union Pacific railroad corridor supports small railway stops such as Apex, Dike, and Garnet. The inclusion of the Boulder Rapids and the settlement of Bonelli provides a view of the river's original state before the massive hydrological engineering projects transformed the region permanently.

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Map Details

Date Portrayed1926
Date Published1926
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:96000
Physical Dimensions23.02 x 26.94 inches

Editions of this 1926 Boulder Canyon Map

Historical Maps of Calico Ridge Through Time

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain