The northern boundary of the United States meets Canada along the southern edge of this topographic survey in Phillips County. This terrain is defined by a dense network of intermittent drainage channels that carve through the landscape, eventually flowing southward into the complex coulee systems characteristic of this border region. The map provides a precise look at the 2020 layout of the land, emphasizing the remote nature of the international boundary line where it intersects this Montana high plains environment.
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This is the sole edition of this map. No revisions or reprints were ever made.
1954 · Glasgow
USGS Topo · 1:250,000
1957 · Glasgow
USGS Topo · 1:250,000
1958 · Glasgow
USGS Topo · 1:250,000
1984 · Thoeny Hills East
USGS Topo · 1:24,000
1984 · Crow Creek Dam
USGS Topo · 1:24,000
1984 · Thoeny Hills West
USGS Topo · 1:24,000
2011 · Thoeny Hills West
USGS Topo · 1:24,000
2011 · Thoeny Hills East
USGS Topo · 1:24,000
2011 · Crow Creek Dam
USGS Topo · 1:24,000
2014 · Thoeny Hills West
USGS Topo · 1:24,000