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2023 Map of Twin Sisters

Name: 2023 Topographic Map of Twin Sisters
Creator: U.S. Geological Survey
Published: 2023
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2023

About this map

Twin Sisters peaks overlook a complex high-altitude drainage system at the convergence of three Idaho counties. This 2023 survey delineates the upper reaches of the Little Weiser River as it winds past Bull Gulch and Carson Gulch near the Adams and Washington county lines. The landscape is defined by the sharp divide between the Payette National Forest in the north and the Boise National Forest to the south, linked by the prominent Payette Ridge.

Navigation through this mountainous terrain centers on Mill Creek Summit, where local routes provide access to remote areas like Rammage Meadows and Squaw Valley. The hydrology of the region is notably detailed, featuring the Chief Eagle-Eye Creek and its major tributary, Third Fork Chief Eagle Eye Creek, which carve through the Third Fork Ridge. These watercourses and their associated landforms, such as Lava Gulch and Buck Canyon, illustrate the geological complexity of the central Idaho highlands.