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2020 Map of Alpowa Ridge

Name: 2020 Topographic Map of Alpowa Ridge
Creator: U.S. Geological Survey
Published: 2020
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2020

About this map

Alpowa Ridge and Darland Ridge dominate this section of the Inland Northwest, where deep drainages and high plateaus define the border between Garfield and Asotin counties. The landscape is characterized by a series of prominent finger ridges, including Valentine Ridge and Palmer Ridge, which overlook the agricultural bottomlands of the Pataha Valley. This area is a network of named gulches and canyons, such as Smith Gulch and Pine Tree Canyon, which channel seasonal water toward Pataha Cr and Alpowa Cr.

The infrastructure is largely tied to these geological features, with narrow roads like Smith Gulch Rd and Sweeney Gulch Rd following the natural contours of the land. Vital water sources for local ranching and land use are noted at Dresser Spring and Kaufman Springs. The map illustrates the transition from the high-elevation Knotgrass Ridge down into the complex canyon systems of South Fork Deadman Gulch and Rickman Gulch.