
The Iowa River valley serves as the central corridor for this 1968 study, where the distinctive communal settlement patterns of the Amana Colonies are clearly visible across the landscape. Clusters of development at West Amana, High Amana, and Middle Amana sit north of the river, while South Amana, Upper South Amana, and Homestead anchor the southern portion of the quadrangle. This era shows the valley before the full impact of inundation, with the Coralville Reservoir beginning to influence the eastern drainage. Transport networks are dominated by two major rail lines, the Chicago Rock Island and Pacific and the Chicago Milwaukee St Paul and Pacific, which parallel the river's course. Local history details include the Maas Cem near the riverbanks and the Swedenborg Ch in the northern hills of St Clair township.
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