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2020 Map of Thompson Flat

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

USGS Topo · Published 2020

About this map

The Umatilla National Forest encompasses the majority of this landscape in eastern Oregon, where the boundary between Morrow and Umatilla counties cuts through a series of high-elevation drainages. The topography is defined by the steep descent of Potamus Cr and Thompson Cr, creating a rugged verticality that isolates high points like Potamus Point. These deep canyons provide a stark contrast to the higher, level reaches of Thompson Flat and Buckaroo Flat.

The presence of numerous seasonal water sources and named springs, such as Bonita Spring and Thompson Falls Spring, points to a landscape carefully managed for forestry and grazing. Remote settlements like Zion Scope are connected only by forest roads such as Brown Creek Road (Snow) and the Gilman Ranch (Snow) route, many of which are designated for winter travel. This network of "snow" roads reflects the seasonal accessibility of the high Blue Mountains country.