Horseshoe Basin defines this high-elevation landscape along the border, where a network of seasonal outposts and camps suggests a region primarily used for recreation, pack-trips, and resource management. Names like Coyote Camp, Cougar Camp, and Lone Wolf Camp are scattered across the terrain, connected by watercourses such as Middle Fork Toats Coulee Creek and Little Horseshoe Creek. The presence of Hodges Horse Pasture and the Iron Gate Campground in the southeast quadrant points to the importance of equestrian and backcountry access. High peaks including Arnold Peak, Goodenough Peak, and Topaz Mountain surround the basin, with Horseshoe Pass serving as a key transit point through the northern mountains. This early 21st-century survey documents the drainage patterns of Queer Creek and Sunny Creek, illustrating the complex hydrology that feeds the larger Coulee systems.
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1906 · Chopaka
USGS Topo · 1:125,000
1954 · Okanogan
USGS Topo · 1:250,000
1955 · Concrete
USGS Topo · 1:250,000
1956 · Horseshoe Basin
USGS Topo · 1:62,500
1958 · Concrete
USGS Topo · 1:250,000
1958 · Okanogan
USGS Topo · 1:250,000
1962 · Concrete
USGS Topo · 1:250,000
1969 · Coleman Peak
USGS Topo · 1:24,000
1969 · Bauerman Ridge
USGS Topo · 1:24,000
1981 · Corral Butte
USGS Topo · 1:24,000