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2014 Map of Cotton Thomas Basin

Name: 2014 Topographic Map of Cotton Thomas Basin
Creator: U.S. Geological Survey
Published: 2014
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2014

About this map

Cotton Thomas Basin sits at the heart of this high-elevation landscape in the northwest corner of Box Elder County, where the Grouse Creek Mountains dominate the southern terrain. This 2014 survey reveals a rugged geography defined by deep basins and drainages, marked by several early mining or water-conveyance infrastructure points like the Phelan Tunnel and Sullivan Tunnel near Pipe Spring Gulch. The northern border of the map tracks the state line between Idaho and Utah, showing the transition from Middle Mountain down through Granite Pass into the southern basins.

Water management and natural drainage patterns are central to the area's layout, with Basin Creek, Mahogany Creek, and Tom Sherry Creek carving through the mountainsides. To the east, Junction Valley provides a break in the terrain, while the western reaches are defined by prominent landmarks like Twin Peaks. The presence of named gulches such as Horse Heaven Gulch and isolated basins like Holt Basin points to a history of high-country grazing and exploration in this remote mountain range.