Grinnell anchors the southwestern corner of this survey, marking the transition from the city's residential grid into the agricultural expanses of Poweshiek County. The landscape is defined by the headwaters of several prominent regional waterways, with Big Bear Cr winding through the center while Abes Fork and Elk Run drain the northern sections. This 2013 topographic study highlights the persistent rectangular survey system of Iowa's rural heartland, where a rigid network of numbered roads like 320th Ave and 50th St sections the terrain. Local transit corridors such as Newburg Rd and Co Hwy F17 connect the outlying farmsteads to the urban center of Grinnell, reflecting the enduring intersection of commercial transit and midwestern agriculture.
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1954 · Des Moines
USGS Topo · 1:250,000
1956 · Des Moines
USGS Topo · 1:250,000
1957 · Des Moines
USGS Topo · 1:250,000
1969 · Des Moines
USGS Topo · 1:250,000
1979 · Grinnell South
USGS Topo · 1:24,000
1979 · Malcom
USGS Topo · 1:24,000
1980 · Newburg
USGS Topo · 1:24,000
1980 · Montour
USGS Topo · 1:24,000
1980 · Tama
USGS Topo · 1:24,000
1980 · Gilman
USGS Topo · 1:24,000