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2017 Map of Lost Horse Plateau

Name: 2017 Topographic Map of Lost Horse Plateau
Creator: U.S. Geological Survey
Published: 2017
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2017

About this map

Lost Horse Plateau and Lincoln Plateau define this high-altitude landscape in central Washington as it appeared in the late 2010s. This terrain is characterized by a dense network of watercourses and Bureau of Indian Affairs (BIA) access routes, reflecting the management of tribal lands and natural resources. The map documents the headwaters of numerous streams, including Toppenish Cr and its northern fork, as well as Wahtum Cr and Agency Cr, which carve through the high plateaus and into features like Old Maid Canyon.

The road network, including Fort Simcoe Rd and various numbered BIA routes like BIA Rd 187 and BIA Rd 211, provides the primary framework for understanding land use and navigation in this remote section of the county. For the local historian or geographer, the map illustrates the precise drainage patterns and topographic relief of the eastern Cascades' foothills, where seasonal runoff from the higher elevations feeds the larger river systems of the Yakima Valley.