Prado Dam is an earth-fill dry dam across the Santa Ana River at the Chino Hills near Corona, California in Riverside County with the resulting impounded water creating Prado Flood Control Basin reservoir.
The U.S. Army Corps of Engineers built the dam in Lower Santa Ana River Canyon.
Prado Flood Control Basin also provides water storage for groundwater recharge operations.
Authorities released water in order to relieve pressure and sent a flood warning to areas downriver of the dam.
The gymnasium at Corona High School was converted by the American Red Cross into a temporary shelter.