FILE - In this Jan. 14, 2005 file photo crews using heavy machinery wok to stop a leak of excess rainwater from the Prado Dam that forced the evacuation of hundreds of homes in Corona, Calif. The U.S. Army Corps of Engineers says a recent assessment has raised concern about the potential for failure of the spillway of a flood control dam on a Southern California river where 1.4 million people live downstream. The Corps said Thursday, May 16, 2019, that it has changed the risk characterization of Prado Dam from moderate urgency to high urgency. (AP Photo/Chris Carlson, File)
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