The enormous remains of a hydraulic scale model built by the U.S. Army Corps of Engineers to simulate flooding across the Mississippi River basin. Concrete channels and miniature river systems still spread through the park like the ruins of an abandoned scientific city.
Filed under weird history: real events too strange to have made the textbook.
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Source: asce.org/about-civil-engineering/history-and-heritage/historic-landmarks/mississippi-basin-model