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1990 Map of Adin Pass
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1990 Map of Adin Pass

USGS Topo · Published 1990

About this map

The rugged divide between Round Valley and the northern plateau is defined by the steep slopes of Schaffer Mountain and Ryan Ridge. This 1990 survey of the Modoc National Forest territory shows a landscape transitioning from historical resource extraction to recreational use. Industrial markers like the Conklin Sawmill (Site), the Lost Cabin Mine, and multiple borrow pits suggest the area’s logging and mining legacy, while the Lower Rush Creek Cpgrd points toward modern forest management. Natural water sources are vital here, with dozens of named springs such as Hoskins Spring and Schaffer Spring feeding canyons like Higgins Canyon. The geography is anchored by the crossing at Adin Pass, where unimproved and 4WD roads traverse the timbered terrain near the Modoc County line.

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Map Details

Date Portrayed1990
Date Published1990
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:24,000
Physical Dimensions21.9 x 26.8 inches

Editions of this 1990 Adin Pass Map

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

Historical Maps of Modoc County Through Time

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain