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1970 Map of Lost Horse Plateau

Name: 1970 Topographic Map of Lost Horse Plateau
Creator: U.S. Geological Survey
Published: 1973
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1973

About this map

Lost Horse Plateau and the adjacent Lincoln Plateau define the high upland geography of the Yakima Indian Reservation in this 1970 survey. The landscape is dominated by a complex network of drainage basins, most notably the numerous branches of Toppenish Creek and Simcoe Creek. Human presence is sparse and largely focused on seasonal or resource-based infrastructure, such as the Olney Corral and a Gravel Pit.

Functional travel routes like the Old Maid Road, Fort Simcoe Road, and Twenty Day Camp Road provide the primary access through these high ridges and valleys. The drainage patterns, including Agency Creek and Clock Creek, suggest a terrain that dictated the placement of these early mountain roads. This map serves as a primary record of the reservation's interior before modern development, capturing the specific naming conventions used for the local creek forks and high-elevation camps.