Henrys Lake dominates the southern landscape of this high-altitude region where the borders of Idaho and Montana converge. This 2017 survey documents a complex intersection of three massive protected areas: the Gallatin National Forest, Targhee National Forest, and Beaverhead National Forest. The Continental Divide snakes through the center of the map, separating the high points of the Henrys Lake Mountains and Targhee Peak from the valleys below. Historical transit through this mountain terrain is centered on Raynolds Pass, a critical corridor for travel between the states.
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This is the sole edition of this map. No revisions or reprints were ever made.
1950 · Cliff Lake
USGS Topo · 1:62,500
1950 · Hebgen Dam
USGS Topo · 1:62,500
1950 · Upper Red Rock Lake
USGS Topo · 1:62,500
1955 · Ashton
USGS Topo · 1:250,000
1958 · Ashton
USGS Topo · 1:250,000
1960 · Ashton
USGS Topo · 1:250,000
1964 · Targhee Pass
USGS Topo · 1:24,000
1964 · Targhee Peak
USGS Topo · 1:24,000
1964 · Sawtell PK
USGS Topo · 1:24,000
1964 · Big Springs
USGS Topo · 1:24,000