1955 Map of Blue Canyon

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.