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1979 Map of Summit Reservoir

Name: 1979 Topographic Map of Summit Reservoir
Creator: U.S. Geological Survey
Published: 1980
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1980

About this map

Volcanic terrain and high-desert water management dominate this late 1970s landscape in southern Idaho. The Bennett Hills and Black Butte Hills are marked by extensive lava flows, illustrating the geological character of the Snake River Plain transition. The scarcity of natural surface water is evident in the dense network of small irrigation and stock impoundments, ranging from Summit Reservoir and Granite Butte Reservoir in the north to the Bailing Reservoir and Landmark Reservoir further south.

Remote infrastructure serves the ranching and transit needs of the era, with the Union Pacific line skirting the northeastern corner near Little Magic Res. Named wells and springs, such as Brailsford Well and Tom Gooding Spring, appear as critical landmarks in a region largely defined by its lack of established towns. The county line between Camas and Lincoln counties bisects the center, cutting through the high country where jeep trails and trails provide the only access across the basalt-strewn plains.