Barnum serves as a central point in this ranching landscape of the southern Big Horn Mountains, where the high plains meet the eastern slopes. The settlement and surrounding homesteads like Graves Ranch and Wolcott Ranch rely on an intricate network of irrigation channels, including the Winsor Ditch, White Panther Ditch, and Barnum Ditch, which divert water from the Beaver Creek and Blue Creek. This complex water-management system illustrates the adaptation required for agriculture in Johnson County's arid environment.
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1955 · Arminto
USGS Topo · 1:250,000
1958 · Arminto
USGS Topo · 1:250,000
1961 · Barnum
USGS Topo · 1:62,500
1962 · Arminto
USGS Topo · 1:250,000
1963 · Mayoworth
USGS Topo · 1:62,500
1967 · Tabletop
USGS Topo · 1:24,000
1967 · Gordon Creek
USGS Topo · 1:24,000
1967 · Turk Springs
USGS Topo · 1:24,000
1979 · Red Fork Powder River
USGS Topo · 1:24,000
1979 · Nowater Creek
USGS Topo · 1:100,000