The international border with Canada defines the northern edge of this 2020 topographic survey, documenting a complex system of river meanders and drainage basins. The landscape is dominated by the winding path of a major river and its intricate network of tributaries that crisscross the terrain before flowing northward across the national boundary. Without mapped roads or named settlements on this particular sheet, the focus remains entirely on the natural hydrography and the physical topography of the borderlands. The detailed contour lines and wetland markers illustrate the environmental transition from the high-latitude mountains toward the northern valley floors, offering a clear record of the watershed as it appeared in the early twenty-first century.
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This is the sole edition of this map. No revisions or reprints were ever made.
1904 · Republic
USGS Topo · 1:125,000
1936 · Marcus
USGS Topo · 1:96,000
1942 · Marcus
USGS Topo · 1:125,000
1948 · Curlew
USGS Topo · 1:62,500
1948 · Togo Mountain
USGS Topo · 1:62,500
1951 · Togo Mountain
USGS Topo · 1:62,500
1951 · Curlew
USGS Topo · 1:62,500
1954 · Okanogan
USGS Topo · 1:250,000
1958 · Okanogan
USGS Topo · 1:250,000
1983 · Boundary Mtn
USGS Topo · 1:24,000