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2015 Map of Chilao Flat

Name: 2015 Topographic Map of Chilao Flat
Creator: U.S. Geological Survey
Published: 2015
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2015

About this map

The San Gabriel Mountains dominate this high-altitude survey of the Angeles National Forest, centering on the flat-bottomed basins that historically served as hubs for pack travel and early mountain recreation. Chilao Flat and Charlton Flat appear as distinct plateaus amidst a complex network of steep drainages, including Big Tujunga Canyon and the headwaters of the W Fork San Gabriel River. The landscape is defined by its prominent summits, such as Strawberry Peak and Mt Hillyer, which offer natural orientation points within the rugged backcountry.

Modern infrastructure for hikers and explorers is well-represented, with the Pacific Crest National Scenic Trail winding through the northern portion near Alder Saddle. The map also captures critical access points and mountain passes like Red Box Gap, where the terrain transitions toward Ladybug Canyon. This topographic record provides a clear look at the drainage patterns of Mill Cr and Alder Cr, reflecting the natural hydrology that shaped the development of this mountainous region.