2017 Map of Cotton Thomas Basin

About this map

Cotton Thomas Basin sits at the heart of this high-elevation landscape where the Grouse Creek Mountains and Goose Creek Mountains meet near the intersection of the Idaho and Utah state lines. The terrain is defined by a series of high basins and sharp peaks, most notably the Twin Peaks and Middle Mountain. Historical infrastructure is evident in the presence of the Phelan Tunnel and Sullivan Tunnel, alongside established routes like Cotton Thomas Basin Rd and E Vipont Rd. This remote corner of Box Elder County is drained by numerous seasonal and perennial waterways including Mahogany Cr, Birch Cr, and Junction Cr, which flow through features like Horse Heaven Gulch and Pipe Spring Gulch. The map provides a clear record of the complex topography at Granite Pass, a natural crossing point for travel between the mountain ranges.