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2021 Map of Loon Lake

Name: 2021 Topographic Map of Loon Lake
Creator: U.S. Geological Survey
Published: 2021
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2021

About this map

Loon Lake and the Union Valley Reservoir anchor this high-elevation landscape within the Eldorado National Forest. The map documents a dense network of backcountry routes, including the historic Rubicon Trl, which winds past features like Chipmunk Bluff and the S Fork Rubicon River. The terrain is defined by dramatic granite formations such as Sun Rock, Slick Rock, and the eastern Crystal Range, punctuated by remote high-country meadows and flats.

Evidence of early stock-driving and mountain camps survives in names like Robbs Valley, Wench Flat, and Cheese Camp Ridge. This area serves as a critical watershed for the American River system, with numerous small lakes like Berts Lake and Francis Lake feeding into the larger drainage basins. The concentration of trails such as the Bassi Trl and Highland Trl suggests a landscape managed for both utility and remote forest access in the Sierra Nevada.