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1935 Map of Irwin

Name: 1935 Topographic Map of Irwin
Creator: U.S. Geological Survey
Published: 1935
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1935

About this map

Snake River flows through the heart of this mid-1930s landscape, winding past the Grand Canyon of the Snake River before reaching the settlement of Irwin. This era was defined by a river-and-forest economy, evidenced by operations like Weeks Sawmill and the presence of numerous specialized outposts including the Swan Valley Ranger Sta and Brockman Ranger Sta. The map captures the remote settlement patterns along the Idaho-Wyoming border, where transit relied on points like Edwards Ferry and the early reaches of State Highway No 22.

In the southern portion of the quadrangle, the high-altitude Caribou Range overlooks Grays Lake and the Caribou Basin. Genealogists and local historians will find several rural educational landmarks, such as Rainy Dale Sch, Hoffman Sch, and Grover Sch, serving dispersed communities like Caribou City and Amesville. The detailed topography illustrates the complex drainage systems of Tincup Creek and Jackknife Creek as they descend toward the Idaho Wyoming State Line.