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2021 Map of Keystone, 2021 Print
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2021 Map of Keystone

USGS Topo · Published 2021

About this map

Keystone sits at the junction of La Grande Rd and Green Springs Rd, serving as a central point in this transition from the Central Valley foothills toward the Sierra Nevada. The landscape is defined by its water management and aviation history, notably featuring the Kistler Ranch Airport and the massive subterranean engineering of the Hetch Hetchy Aqueduct, which cuts diagonally across the southwestern corner of the quadrangle. In the north, the Stanislaus River marks the boundary between Calaveras and Tuolumne counties, while the eastern edge is dominated by the Red Hills and Rushing Mtn. This area reflects a classic California ranching and utility corridor, where long-established routes like Tulloch Rd and Rock River Rd weave between seasonal drainages such as Owl Cr and Mountain Pass Cr.

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Map Details

Date Portrayed2021
Date Published2021
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:24,000
Physical Dimensions24 x 29 inches

Editions of this 2021 Keystone Map

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

Historical Maps of Calaveras County Through Time

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain