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2021 Map of Graven Ridge, 2021 Print
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2021 Map of Graven Ridge

USGS Topo · Published 2021

About this map

Modoc National Forest territory dominates this high-country landscape, where complex water management systems define the local geography. Significant catchment features like Graven Reservoir, Clarks Reservoir, and Bayley Reservoir are strategically positioned to capture seasonal runoff from the surrounding uplands. The terrain is marked by distinctive formations such as Graven Ridge and the Portuguese Ridge to the west, separated by drainages like Canyon Cr and the S Fork Canyon Cr. This network of springs—including Lundsford Spring, Arnett Spring, and Big John Spring—indicates the vital role of groundwater in sustaining both the ecology and the local ranching or forestry infrastructure of this Modoc County region. The residential and access patterns are clustered along named corridors like California Pines Blvd, which contrast with the open expanses of Rocky Prairie and Rye Grass Swale.

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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 Graven Ridge 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