High Quality Content by WIKIPEDIA articles! The Prado Dam is a rock-fill dam on the Santa Ana River near Corona, California in Riverside County. The U.S. Army Corps of Engineers built the dam in Lower Santa Ana River Canyon. Its primary purpose is flood control and it is the downstream element of the Santa Ana River's flood control system, which is a natural constriction about 30.5 miles (49.1 km) upstream from the ocean. The area upstream from the dam contains 2,255 square miles (5,840 km2) of the watershed's 2,450 square miles (6,300 km2). The dam's construction was authorized in 1936 and the flood of 1938 demonstrated its necessity. Construction was completed in 1941. As of 2005 work to increase the downstream channel's capacity from 5,000 to 30,000 cubic feet per second is ongoing. The total costs of the improvements is estimated at $400 million.

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