2004 Map of Mount Lyell

About this map

Mount Lyell and the surrounding high-altitude wilderness are depicted here in the early 2000s, where the boundaries of Yosemite National Park, Ansel Adams Wilderness, and Sierra National Forest converge. This survey captures a specific glaciated landscape prior to significant modern retreats, detailing both the Lyell Glacier and Maclure Glacier below their respective peaks. The high-country drainage system is remarkably clear, showing the headwaters of the Merced River and the Lyell Fork. This area is defined by its topographic extremes, including Triple Divide Peak and the Clark Range, which serve as critical hydrological junctions. Backcountry researchers can trace established paths through Isberg Pass and Post Peak Pass, which have historically connected these high-Sierra regions.