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2015 Map of Seven Lakes Basin

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

USGS Topo · Published 2015

About this map

The Trinity Mountains define this high-altitude landscape where the headwaters of several major drainages diverge. The S Fork Sacramento River and the E Fork Trinity River originate among these peaks, carved by deep glacial features like the Seven Lakes Basin. This area serves as a critical hydrological nexus within the Shasta National Forest, where snowmelt feeds alpine catchments such as Castle Lake, Scott Lake, and Cedar Lake.

The presence of naming conventions like Asbestos Gulch, Soapstone Gulch, and Grader Gulch indicates a history of resource extraction and trail development in the difficult terrain. High-elevation landmarks such as Grey Rocks, Whalan Summit, and Boulder Peak dominate the skyline, while the Pacific Crest National Scenic Trail traverses the ridges, connecting points like Devils Pocket and Horse Heaven Meadows. The map also captures the convergence of Siskiyou, Shasta, and Trinity counties, marking a significant political and geographic boundary in Northern California.