West Pryor Mtn anchors this terrain in southern Montana, where the boundary between Carbon and Big Horn counties cuts through a complex system of drainage and relief. The landscape is defined by the deep incisions of Black Canyon and Section House Draw, reflecting the geological character of the Pryor Mountains. Seasonal and perennial water sources like Sand Spring and Bird Spring provided critical watering points for early travel through this arid region. The drainage network is particularly dense, with the N Fork, Middle Fork, and original Fivemile Cr converging to the west, while Bluewater Cr and its southern fork dominate the central reaches. A primary passage through the high country is marked by the Pryor Gap, a distinctive natural break in the mountain topography utilized by Pryor Gap Rd.
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1954 · Billings
USGS Topo · 1:250,000
1956 · Edgar
USGS Topo · 1:24,000
1957 · Billings
USGS Topo · 1:250,000
1958 · Billings
USGS Topo · 1:250,000
1967 · Castle Rocks
USGS Topo · 1:24,000
1967 · Pryor
USGS Topo · 1:24,000
1967 · Section House Draw
USGS Topo · 1:24,000
1967 · Bluewater
USGS Topo · 1:24,000
1967 · Pryor NW
USGS Topo · 1:24,000
1969 · Bowler
USGS Topo · 1:24,000