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Saint Anthony Falls, or the Falls of Saint Anthony, located northeast of downtown Minneapolis, Minnesota, was the only natural major waterfall on the Upper Mississippi River. The natural falls was replaced by a concrete overflow spillway (also called an "apron") after it partially collapsed in 1869. Later, in the 1950s and 1960s, a series of locks and dams were constructed to extend navigation to points upstream

00:14, 15 December 2011