Primghar, the county seat of O'Brien County, anchors the northwestern corner of this agricultural landscape. The terrain sits upon the Coteau des Prairies, a vast plateau that influences the drainage patterns of the region's numerous small waterways, including Little Waterman Cr and Ginger Cr. This 2018 survey reveals a highly organized township structure dominated by a grid of rural roads such as 370th St and Co Rd B40, reflecting the enduring surveyor's layout of the American Midwest.
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This is the sole edition of this map. No revisions or reprints were ever made.
1954 · Fairmont
USGS Topo · 1:250,000
1954 · Fort Dodge
USGS Topo · 1:250,000
1957 · Fort Dodge
USGS Topo · 1:250,000
1958 · Fort Dodge
USGS Topo · 1:250,000
1958 · Fairmont
USGS Topo · 1:250,000
1964 · Primghar
USGS Topo · 1:24,000
1964 · Plessis
USGS Topo · 1:24,000
1964 · Gaza
USGS Topo · 1:24,000
1964 · Sanborn
USGS Topo · 1:24,000
1970 · Hartley SW
USGS Topo · 1:24,000