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1959 Map of In-ko-pah Gorge, 1978 Print
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1959 Map of In-ko-pah Gorge

USGS Topo · Published 1978

About this map

In-Ko-Pah Gorge cuts through the high desert of the Jacumba Mountains on this survey, highlighting a critical pass between the Imperial Valley and the coast. The terrain is marked by significant historical transit infrastructure, most notably at Mountain Spring, where a Stage Station Historical Marker denotes the site of a vital desert watering hole and stopover. The map reveals a landscape heavily prospected for minerals, documenting various operations such as the Easy Pickins Mine, Little Randsburg Mine, and Mica-Gem Mine. The 1975 revisions in purple trace the evolving path of the Imperial Highway as it navigates the steep descent from the In-Ko-Pah County Park area toward Ocotillo. Along the international border with Mexico, features like Smugglers Cave and the Elliot Mine are located near the intersection of the San Diego and Imperial County line.

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Map Details

Date Portrayed1959
Date Published1978
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:24,000
Physical Dimensions22 x 27.8 inches

Editions of this 1959 In-ko-pah Gorge Map

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain