
This remote northern frontier area along the international border is defined by a dense network of high-altitude drainages and seasonal watercourses flowing south from the boundary with Canada. The landscape is dominated by complex topographical relief, where unnamed ridges and valleys create a rugged hydrologic pattern that eventually feeds into the larger basins of northern Okanogan County. While the map is sparse in terms of human-made landmarks, the presence of the international line indicates a region where federal land management is paramount, primarily under the jurisdiction of the U.S. Forest Service and Bureau of Land Management. The intricate contour lines and drainage systems reveal a wilderness environment largely untouched by permanent settlement or development, preserved for its natural watershed value.
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This is the sole edition of this map. No revisions or reprints were ever made.
1920 · Slate Pass
USGS Topo · 1:125,000
1955 · Concrete
USGS Topo · 1:250,000
1958 · Concrete
USGS Topo · 1:250,000
1962 · Concrete
USGS Topo · 1:250,000
1969 · Frosty Creek
USGS Topo · 1:24,000
1969 · Ashnola Mtn
USGS Topo · 1:24,000
1969 · Tatoosh Buttes
USGS Topo · 1:24,000
2002 · Ashnola Mountain
USGS Topo · 1:24,000
2002 · Tatoosh Buttes
USGS Topo · 1:24,000
2002 · Frosty Creek
USGS Topo · 1:24,000