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2015 Map of Thompson Peak

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

USGS Topo · Published 2015

About this map

Summerville and Petersburg sit along the northern reaches of this high-elevation terrain where the S Fork Salmon River carves through the Salmon Mountains. The map reveals a landscape defined by sharp drainage divides and alpine basins, spanning the boundary between Klamath National Forest and Trinity National Forest. Steep gulches like Black Gulch and Ault Gulch feed into the river systems, while the southern portion of the sheet is dominated by the high peaks of the Coast Ranges.

Glacial features are evident in the cluster of high-altitude water bodies including Grizzly Lake, Emerald Lake, and Sapphire Lake situated beneath Thompson Peak. The presence of Schoolhouse Flat near the river suggests early localized settlement or administrative activity within the forest. Notable landmarks such as Grizzly Butte and the sharp spine of Sawtooth Ridge mark the rugged divide between Siskiyou and Trinity counties.