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1990 Map of Ascension Mountain

Name: 1990 Topographic Map of Ascension Mountain
Creator: U.S. Geological Survey
Published: 1990
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1990

About this map

The confluence of the Middle Fork Tuolumne River and the South Fork Tuolumne River anchors this high-elevation landscape within the Stanislaus National Forest. The map documents a rugged infrastructure network, notably the underground path of the Hetch Hetchy Aqueduct (Tunnel) cutting through the northern peaks near Jones Meadow. In the central valley, the small settlement of Harden Flat serves as a transition point for visitors to the Berkeley-Tuolumne Campground and those traveling via Harden Flat Road.

Tracing the southern terrain toward the Tuolumne and Mariposa county line, the map reveals old industrial and transport scars, including an Old RR Grade and several Prospects. High ridges like Pilot Ridge and Crocker Ridge overlook the Big Creek Basin, while prominent summits such as Ascension Mountain and Sawmill Mountain define the divide between the river forks. This provisional record provides a detailed look at the interface between managed forest lands and the western boundary of Yosemite National Park.