
Horse Prairie dominates the southern landscape of this Beaverhead County region, revealing a complex network of agricultural water management and ranching history in the late 1980s. The presence of the Cross Ditch Canal and the Mansfield-Prohosky Ditch underscores the vital importance of irrigation to high-altitude cattle operations. Traditional holdings such as the Hughes Ranch and Pierce Ranch are situated near the seasonal flows of Horse Creek and Prairie Creek, while an Old Railroad Grade provides a physical trace of former transportation corridors across the flats.
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This is the sole edition of this map. No revisions or reprints were ever made.
1955 · Dubois
USGS Topo · 1:250,000
1955 · Dillon
USGS Topo · 1:250,000
1957 · Dillon
USGS Topo · 1:250,000
1958 · Dubois
USGS Topo · 1:250,000
1958 · Dillon
USGS Topo · 1:250,000
1959 · Grant
USGS Topo · 1:62,500
1962 · Dillon
USGS Topo · 1:250,000
1965 · Dillon
USGS Topo · 1:250,000
1965 · Jeff Davis Peak
USGS Topo · 1:24,000
1965 · Hansen Ranch
USGS Topo · 1:24,000