
Cohagen sits along the southern edge of the Big Dry Creek drainage system, serving as a focal point in a landscape defined by an intricate network of seasonal watercourses. The drainage patterns are particularly dense here, with White Horse Creek and Red Horse Creek converging toward the wider valley of Little Dry Creek. This settlement pattern reflects the necessity of water access in Garfield County's rangelands, where roads like W Little Dry Rd and Hay Creek Rd follow the natural contours of the stream beds.
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1954 · Jordan
USGS Topo · 1:250,000
1954 · Forsyth
USGS Topo · 1:250,000
1956 · Jordan
USGS Topo · 1:250,000
1957 · Forsyth
USGS Topo · 1:250,000
1958 · Jordan
USGS Topo · 1:250,000
1958 · Forsyth
USGS Topo · 1:250,000
1964 · Jordan
USGS Topo · 1:250,000
1965 · Black Hills
USGS Topo · 1:24,000
1965 · Cohagen
USGS Topo · 1:24,000
1965 · Calamity Coulee
USGS Topo · 1:24,000