Palisades Dam stands as the central engineering feature of this landscape, impounding the Snake River to form the expansive Palisades Reservoir. The surrounding terrain is a complex network of steep canyons and high ridges, including Sheep Creek Peak and Poker Peak, split between the Targhee National Forest and Caribou National Forest. Settlement is concentrated in the northwest corner, where the community of Irwin and the village of Swan Valley sit near the river's path before it enters the canyon depths.
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1932 · Irwin
USGS Topo · 1:96,000
1935 · Irwin
USGS Topo · 1:125,000
1955 · Driggs
USGS Topo · 1:250,000
1958 · Driggs
USGS Topo · 1:250,000
1962 · Driggs
USGS Topo · 1:250,000
1966 · Palisades Peak
USGS Topo · 1:24,000
1966 · Alpine
USGS Topo · 1:24,000
1966 · Big Elk Mtn
USGS Topo · 1:24,000
1966 · Thompson Peak
USGS Topo · 1:24,000
1966 · Red Ridge
USGS Topo · 1:24,000