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2017 Map of Twentymile Butte

Name: 2017 Topographic Map of Twentymile Butte
Creator: U.S. Geological Survey
Published: 2017
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2017

About this map

Twentymile Butte stands as a prominent landmark in this high-desert region of Southern Idaho, where the border between Elmore and Owyhee counties is defined. The landscape is characterized by a network of drainage systems cutting through the arid plains, including Rosevear Gulch, Deer Gulch, and the seasonal flow of Deadman Cr. This area represents the northern reaches of the Bruneau Desert, a topography of plateaus and mesas such as Flint Mesa.

Transportation across this arid stretch relies on long-established routes like Glenns Ferry Castleford Rd and E Flint Mesa Rd, which connect the high flats to the Snake River valley to the north. Surveyed features such as Deadman Flat and Big Pilgrim Gulch suggest the difficult passage early travelers faced through this water-scarce terrain. The map provides a precise view of the Public Land Survey System grid, which continues to dictate property and grazing boundaries across these open rangelands.