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2023 Map of Twelvemile Ridge

Name: 2023 Topographic Map of Twelvemile Ridge
Creator: U.S. Geological Survey
Published: 2023
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2023

About this map

Twelvemile Ridge dominates this high-desert portion of Malheur County, providing a high divide between the seasonal drainages of the Great Basin. The landscape is defined by the sharp elevations of Three Man Butte and the long incline of Twelvemile Hill Grade. A network of unpaved ranch and range roads provides the only access through this remote territory, indicating the area's continued use for livestock grazing and land management.

Intermittent water sources like Duck Creek and Twelvemile Creek carve distinct paths through the terrain, though their flow is dictated by the high-desert climate. The presence of Echave Ranch Rd and Whitehorse Rd reflects the ranching history of the region, connecting isolated basins and ranges across township lines. This survey captures the sparse infrastructure and natural geography of the Oregon backcountry in the early twenty-first century.