The Canada / United States of America international boundary defines the southern edge of this 2014 survey, marking the transition between the northern reaches of Okanogan Co, Washington, and the British Columbia interior. This map focuses on a high-latitude wilderness area where the complex network of unnamed mountain drainages and seasonal creek beds forms the primary geographic character. The lack of named roads or settlements underscores the isolation of this borderland region, which primarily serves as a corridor for natural hydrography and forestry management across the 49th parallel. Historically significant for its placement along the surveyed line between two nations, the map provides a precise look at the drainage patterns that flow across political boundaries, illustrating the landscape as it appeared just before the mid-2010s.
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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