
The confluence of the Mississippi River and the Iowa River dominates this mid-century survey, revealing a landscape defined by complex water management and river navigation. Near the town of New Boston, the river system fractures into a network of side channels and backwaters such as Sturgeon Bay, Mill Slough, and Boston Bay. The industrial and navigational importance of the waterway is anchored by Lock and Dam No 17 and a nearby Pumping Station, while the rural interior is dotted with local landmarks like Swan Lake Sch and Pin Oak Sch. This 1946 topography, compiled in part from 1938 aerial photography, provides a clear view of the numerous islands—including Mickey Island, Otter Island, and Jonas Johnson Island—that shift and change with the river's flow. Much of the western portion remains an Unsurveyed Area, contrasting the developed riverbanks with the less charted terrain beyond.
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