Loading map...

1986 Map of Mumbo Basin

Name: 1986 Topographic Map of Mumbo Basin
Creator: U.S. Geological Survey
Published: 1986
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1986

About this map

The Trinity Mountains dominate this high-elevation landscape within the Shasta National Forest, where the border between Siskiyou and Trinity counties follows the ridgeline of the Eddys. This mid-1980s provisional survey shows a wilderness defined by its complex drainage systems and subalpine lakes, including Gumboot Lake, Picayune Lake, and the remote Mumbo Lake at the head of Mumbo Basin.

Resource extraction and long-distance recreation coexist here, with the Pacific Crest National Scenic Trail winding across the northern ridges while the legacy of mercury and cinnabar mining is preserved at the Altoona Mine and Integral Mine. To the south, the terrain drops toward the East Fork Trinity River, passing through uniquely named landmarks like The Bedstead and Cinnabar Gulch. The map captures the area before modern developments, documenting a network of gulches and ridges like Sherer Ridge and Bear Ridge that have long served as essential markers for navigation in the backcountry.