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2013 Map of Twin Sisters

Name: 2013 Topographic Map of Twin Sisters
Creator: U.S. Geological Survey
Published: 2013
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2013

About this map

Twin Sisters towers over a landscape defined by the intersection of three Idaho counties—Adams, Washington, and Gem—within the shared boundaries of the Payette National Forest and Boise National Forest. The drainage patterns here are complex, featuring the headwaters of the Little Weiser River in the north and the extensive Squaw Cr system to the south.

Evidence of human activity is concentrated along the forest road networks, specifically at Mill Creek Summit and the Third Fork Project Camp near the southern boundary. The map documents a series of named landforms such as Third Fork Ridge and Lava Gulch, providing a detailed look at the resource management and topography of the West Mountains area before more recent changes in forest access. Key transit corridors like Squaw Creek Rd follow the natural contours of the deep gulches and creek beds that carve through these national forests.