The Similkameen River carves a deep path through the northern reaches of Okanogan County, defining a landscape where narrow valleys meet high peaks. Near the international border, the settlement of Nighthawk sits along the Loomis Oroville Rd, serving as a gateway to the steep terrain of American Butte and Little Chopaka Mtn. The area's diverse hydrology is evident in the transition from the flowing waters of Champneys Slough Stream and Edwards Slough to the still basins of Chopaka Lake and the northern tip of Palmer Lake.
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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
1981 · Duncan Ridge
USGS Topo · 1:24,000
1982 · Enterprise
USGS Topo · 1:24,000
1982 · Loomis
USGS Topo · 1:24,000