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1991 Map of Porphyry Peak
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1991 Map of Porphyry Peak

USGS Topo · Published 1991

About this map

Rosenkrance Ranch sits at the southern edge of this high-elevation terrain, where the East Fork Big Lost River meets the Big Lost River. The landscape is dominated by the steep southern ridges of the White Cloud Mountains and the sprawling territory of the Challis National Forest. This 1991 provisional map highlights the vertical complexity of the region, from the prominent Porphyry Peak and Challis Knob to the sheer formation at Castle Rock.

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Map Details

Date Portrayed1991
Date Published1991
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:24,000
Physical Dimensions22 x 26.8 inches

Editions of this 1991 Porphyry Peak Map

This is the sole edition of this map. No revisions or reprints were ever made.

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain