Plessis occupies a central position in this corner of O'Brien County, where the agricultural grid meets the subtle eastern rise of the Coteau des Prairies. This highland landform influences the local drainage patterns, sending waters through numerous small runs such as Plessis Cr, Epping Cr, and the Floyd River. The landscape is defined by a dense network of township roads, including Sorrel Ave and Tanager Ave, which connect the scattered farmsteads typical of northwest Iowa. To the south, Randolph Cem sits near Co Hwy B24, serving as a quiet landmark in a region where the economy is tied to the soil and the seasonal flow of the Little Waterman Cr.
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1954 · Fairmont
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
1970 · Hartley
USGS Topo · 1:24,000
1970 · May City
USGS Topo · 1:24,000
1972 · Cloverdale
USGS Topo · 1:24,000