YANKTON, South Dakota — What is now the southeast corner of South Dakota doesn’t look anything like it did when Lewis and Clark came through in 1804 and 1806. On a map, the sliver of land, bounded by the Missouri and Big Sioux rivers, still resembles a little beard growing off the chin of the square-faced state. But Lewis and Clark didn’t have maps.And today, the Missouri has been forever changed by a half-dozen dams built in the last century for flood control, water supply and power […]



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