Pahsimeroi Valley serves as the central corridor of this Idaho landscape, where the Pahsimeroi River meanders along the border of Lemhi and Custer counties. This high-desert valley is flanked by the towering heights of the Lost River Range and the Pahsimeroi Mountains, creating a dramatic contrast between the irrigated agricultural floor and the surrounding mountain slopes. The small settlement of May is the primary hub, supported by the May Airport and a network of local thoroughfares like Main St and Hooper Ln.
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1929 · Bayhorse
USGS Topo · 1:125,000
1935 · Borah Peak
USGS Topo · 1:125,000
1938 · Borah Peak
USGS Topo · 1:125,000
1955 · Dubois
USGS Topo · 1:250,000
1956 · Doublespring
USGS Topo · 1:62,500
1956 · May
USGS Topo · 1:62,500
1956 · Challis
USGS Topo · 1:62,500
1957 · Challis
USGS Topo · 1:250,000
1958 · Dubois
USGS Topo · 1:250,000
1960 · Challis
USGS Topo · 1:250,000