History
The river was named for former deposits of bluish-green clay, no longer visible, along the banks of the river. The stream was called Makato Osa Watapa by the Dakota Indians, meaning "the river where blue earth is gathered." The French explorer Pierre-Charles Le Sueur established Fort L'Huillier near the river's mouth in 1700 for the purpose of mining the clay, either in the mistaken belief that the clay contained copper, or as a ruse to secure funding from his patrons for his fur trading activities. The fort was abandoned the following year after an attack by the Fox tribe. In the 19th century, the geographer Joseph Nicollet found cavities from which the clay had been dug by Native Americans in the region, who used it as body paint; he found no evidence of Le Sueur's mines, nor of the fort.
Read more about this topic: Blue Earth River
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