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1991 Map of Mc Guire Ridge
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1991 Map of Mc Guire Ridge

USGS Topo · Published 1991

About this map

Zeni Ranch, Giannoli Ranch, and Clapusci Ranch stand as primary evidence of rural settlement across this interior stretch of the Mendocino and Sonoma county line in 1991. The landscape is defined by the complex drainage systems of the North Fork Gualala River and South Fork Gualala River, which carve deep canyons and gulches between prominent elevations like Mc Guire Ridge and Gualala Mtn. Evidence of human activity is concentrated along ridgeline routes such as the McKenzie Grade, which features the sharp Jackknife Turn, and distinctive clearings like the Lowery Openings and Cox Opening. To the south, the map indicates the historic township of German, while features like Horsethief Canyon and Peachtree Flat reflect a long history of local land use and geographic naming in the California coastal range.

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Map Details

Date Portrayed1991
Date Published1991
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:24,000
Physical Dimensions21.4 x 26.7 inches

Editions of this 1991 Mc Guire Ridge Map

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

Historical Maps of Old Red Rock Place Through Time

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain