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1956 Map of Hetch Hetchy Reservoir

Name: 1956 Topographic Map of Hetch Hetchy Reservoir
Creator: U.S. Geological Survey
Published: 1968
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1968

About this map

The Grand Canyon of the Tuolumne River anchors this mid-century survey of the high Sierras, tracing the complex water systems that define the region. From the sprawling Hetch Hetchy Reservoir to the iconic Upper Yosemite Fall, the map documents the vertical landscape of Yosemite National Park during a period of expanding recreational infrastructure. The survey details the established camps at White Wolf and Yosemite Village, as well as the transition from early pioneer routes like the Old Big Oak Flat Road to the more modern Tioga Road.

Grounded in 1955 aerial photography, the map highlights the intersection of high-altitude topography and human management, including the Hetch Hetchy Ranger Sta and various campgrounds like Porcupine Flat Campgrounds. This data serves as a precise record of the granite domes, such as North Dome and Basket Dome, and the high meadows that have drawn naturalists and surveyors to the Tuolumne and Mariposa county line for over a century.