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2020 Map of Mount Lyall

Name: 2020 Topographic Map of Mount Lyall
Creator: U.S. Geological Survey
Published: 2020
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2020

About this map

The Stehekin River flows through the northeast corner of this high-elevation landscape, where the North Cascades National Park meets the Lake Chelan National Recreation Area and the Wenatchee National Forest. The dramatic topography is defined by prominent peaks and ridges, including Lyall Mt, Devore Peak, and the jagged Tupshin Peak. Hikers of the modern era can trace the path of the Pacific Crest National Scenic Trail as it winds near Agnes Gorge and follows the course of Agnes Cr.

Glacial features and alpine basins are central to this terrain, notably the Fourth of July Basin and several high-altitude water bodies like Marie Lake and Battalion Lake. The map details a complex network of drainages, from Company Creek to the smaller Sable Cr, illustrating the watershed patterns that feed into the Lake Chelan valley. This area remains a preserved wilderness, showing the intersection of major federal land designations and the high summits of the North Cascades.