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2012 Map of Ervay Basin

Name: 2012 Topographic Map of Ervay Basin
Creator: U.S. Geological Survey
Published: 2012
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2012

About this map

The S Fork Powder River meanders through the heart of the Ervay Basin, a landscape defined by ranching and resource extraction in Natrona County. This early 21st-century survey documents a region where energy infrastructure and high-plains agriculture coexist, shown through the presence of the Gas Hills Rd and the nearby Gas Hills Airstrip. To the east, the small settlement of Raderville sits near the intersection of several remote transport routes.

Physical landmarks like Maverick Butte and Cyclone Ridge provide vertical relief against the wide basin floor. Water management is critical in this arid environment, evidenced by the Defelder Reservoir and numerous natural water sources including JE Sulphur Spring and Collins Spring. Ranching heritage is preserved in labels like the JE Ranch, while the industrial character of the area is highlighted by the prominent Bulter Oil Rd.