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1955 Map of Blue Canyon, 1976 Print
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1955 Map of Blue Canyon

USGS Topo · Published 1976

About this map

The Southern Pacific railroad corridor serves as the industrial spine of this mid-century Sierra Nevada landscape, threading through the steep transition from Bear Valley to the ridge at Emigrant Gap. This 1955 survey captures the complex infrastructure of the California water and power system, dominated by Lake Spaulding, the Drum Canal, and the South Yuba Canal. These features, alongside the Rim Powerhouse and Siphon, illustrate the massive engineering required to manage the descent of the South Yuba River and Bear River for regional utilities.

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Map Details

Date Portrayed1955
Date Published1976
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:24,000
Physical Dimensions22 x 26.8 inches

Editions of this 1955 Blue Canyon Map

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain