The northernmost edge of the Canada border defines the geographic extent of this topographic study, where the international boundary line cuts across a landscape dominated by complex drainage systems and varied terrain. Based on a collection of hydrographic and elevation data spanning from 1899 to 2019, the map reveals the intricate network of watercourses flowing toward the southern border. While the area is largely devoid of named settlements or individual buildings in this specific quadrangle view, the detailed contouring provided by the U.S. Geological Survey illustrates the transition of the northern interior landscape as it approaches the boundary with British Columbia. This map serves as a precise reference for understanding the physical geography and hydrological patterns at the edge of the United States border region.
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This is the sole edition of this map. No revisions or reprints were ever made.
1906 · Chopaka
USGS Topo · 1:125,000
1954 · Okanogan
USGS Topo · 1:250,000
1956 · Loomis
USGS Topo · 1:62,500
1956 · Horseshoe Basin
USGS Topo · 1:62,500
1958 · Okanogan
USGS Topo · 1:250,000
1981 · Hurley Peak
USGS Topo · 1:24,000
1981 · Nighthawk
USGS Topo · 1:24,000
1982 · Bullfrog Mtn
USGS Topo · 1:24,000
1984 · Oroville
USGS Topo · 1:100,000
2001 · Hurley Peak
USGS Topo · 1:24,000