Loading map...

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

Irwin and the surrounding high country of the Caribou Range dominate this mid-1930s survey along the Idaho-Wyoming border. The Snake River carves a deep path through the Grand Valley, supported by essential river crossings like Edwards Ferry and early infrastructure like State Highway No 22. This was a landscape of small, dispersed communities and mountain industry, evidenced by the Weeks Saw Mill near the Snake River Range and a dense network of rural schoolhouses such as Fidelity Sch and Rainy Dale Sch.

The presence of numerous remote outposts, including the Caribou Basin Ranger Sta and Brockman Ranger Sta, underscores the era's reliance on localized management of the backcountry. To the south, the expansive waters of Grays Lake are flanked by the Grays Lake Ranger Sta and Grays Lake Sch, marking a shift toward the high-altitude wetlands and basins. The map also preserves the location of Caribou City, providing a detailed look at the region's early mining and timber-based settlement pattern before later development altered these mountain valleys.