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1992 Map of Hetch Hetchy Reservoir

Name: 1992 Topographic Map of Hetch Hetchy Reservoir
Creator: U.S. Geological Survey
Published: 1995
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1995

About this map

Hetch Hetchy Reservoir dominates this 1990s-era topographic survey, illustrating the managed water landscape of Yosemite National Park. The map documents the dramatic transition from the high-elevation peaks like Mount Gibson and Smith Peak down into the Grand Canyon of the Tuolumne. The presence of the Wilderness Boundary and the Yosemite Wilderness designation reflects modern federal land management and conservation efforts during this period.

Researchers can trace a network of transportation routes through the high country, including numerous Pack Trails and a Footbridge crossing near Tiltill Creek. Beyond the central reservoir, the map detail extends to natural features such as Rancheria Falls, Harden Lake, and the remote Tiltill Valley, alongside essential park infrastructure including a Sewage Disposal Pond. The drainage patterns of Rancheria Creek and the Middle Tuolumne River provide a detailed record of the Tuolumne County watershed in the late twentieth century.