2018 Map of Mount Lyell

About this map

Yosemite National Park, Inyo National Forest, and Sierra National Forest converge at this high-altitude point in the Sierra Nevada, dominated by the massive Cathedral Range and Ritter Range. The map centers on the headwaters of the Merced River system, showing the Lyell Fork Merced River and multiple feeder streams like Triple Peak Fork and Merced Peak Fork as they drain the glaciated high country. Significant peaks including Mt Lyell, Mt Maclure, and Mt Ansel Adams define the skyline, while high-basin water bodies like Florence Lake, Washburn Lake, and the Isberg Lakes dot the landscape between ridges. Surveyed in 2018, this data shows the complex drainage patterns and alpine topography that have drawn mountaineers and researchers to the region for over a century, including the critical Isberg Pass which serves as a key passage through the Isberg trail network.