The international boundary of Canada/United States of America defines the southern extent of this 2017 survey, where the Okanogan-Similkameen region of British Columbia meets the northern edge of Washington state. The landscape is characterized by a dense network of high-elevation drainage systems and intermittent streams that feed into the larger river valleys beyond the map's margins. This specific quadrangle reflects the modern cartographic standards of the U.S. Geological Survey while documenting a remote section of the borderlands where topographic relief and water resource management are the primary features of the land. The presence of the border illustrates the continued importance of the 49th parallel as a geopolitical dividing line through the northern wilderness.
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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 · Horseshoe Basin
USGS Topo · 1:24,000
1981 · Hurley Peak
USGS Topo · 1:24,000
1981 · Nighthawk
USGS Topo · 1:24,000
1984 · Oroville
USGS Topo · 1:100,000
2001 · Hurley Peak
USGS Topo · 1:24,000