
The Big Sioux River and the Missouri River converge at the tristate junction of South Dakota, Iowa, and Nebraska, defining a landscape of complex waterways and seasonal basins. This 1963 survey, updated in 1971, highlights the river-driven geography of Union County, South Dakota, where the Chicago Milwaukee St Paul and Pacific railroad and Interstate 29 run parallel through the town of Jefferson. The area is characterized by oxbow formations and remnants of former river channels, including Goodenough Lake, Mud Lake, and Mc Cook Lake, which illustrate the shifting nature of the Missouri floodplain.
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