Pahsimeroi Valley serves as the central pastoral corridor of this high-altitude landscape, where the Pahsimeroi River winds between the towering peaks of the Lost River Range and the Pahsimeroi Mountains. The small settlement of May is the primary focal point of human activity, supported by the May Airport and the local May Cem. The land use is defined by a network of drainage creeks such as Sulphur Cr, Lawson Cr, and Morse Cr that feed into the valley from the steep surrounding terrain. Notable geographic features like Burnt Spring Gulch and Blind-Fork Trail Cr highlight the transition from the valley floor to the rugged wilderness. A series of country roads, including Custer Rd and Pahsimeroi Rd, connect the scattered ranching interests along the river, illustrating the region's long-standing agricultural and transport patterns.
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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