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1948 Map of Twentymile Butte

Name: 1948 Topographic Map of Twentymile Butte
Creator: U.S. Geological Survey
Published: 1964
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1964

About this map

High desert plateaus and deeply eroded drainages define this 1940s landscape along the border of Elmore and Owyhee Counties. The terrain is dominated by prominent landforms such as Flint Mesa and Twentymile Butte, showing the intricate network of seasonal watercourses like Rosevear Gulch and Big Pilgrim Gulch that carve through the high country.

Remote infrastructure is sparse but essential, centered on the transit route of the Glenns Ferry Castleford Road. To the south, the landscape levels out at Deadman Flat, where a Reservoir and an associated Dike indicate early efforts to manage the scarce water of Deadman Creek for livestock or ranching. The map captures a moment when topography dictated movement, and the few named roads served as the primary arteries through the Idaho backcountry.