Challis National Forest land dominates this high-altitude terrain along the border of Lemhi and Custer counties. The landscape is defined by the headwaters of numerous drainages, most notably the Yankee Fork and the S Fork Warm Spring Cr, which carve deep canyons between peaks like Parker Mtn. The presence of the Parker Mill site along Warm Spring Cr suggests the area's history of extraction and processing within these isolated mountain reaches. The complex network of creeks, including Trapper Cr and Wickiup Cr, highlights a topography shaped by seasonal runoff and historic trails through the central Idaho wilderness.
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1919 · Custer
USGS Topo · 1:125,000
1922 · Custer
USGS Topo · 1:125,000
1929 · Bayhorse
USGS Topo · 1:125,000
1930 · Casto
USGS Topo · 1:125,000
1956 · Twin Peaks
USGS Topo · 1:62,500
1957 · Challis
USGS Topo · 1:250,000
1960 · Challis
USGS Topo · 1:250,000
1963 · Challis
USGS Topo · 1:250,000
1963 · Challis Creek Lakes
USGS Topo · 1:24,000
1963 · Custer
USGS Topo · 1:24,000