The risk category for Orange County's Prado Dam has moved from 'moderate' to 'high urgency' after an Army Corps of Engineers inspection
Stormwater flows down the Santa Ana River channel from Prado Dam while hydrologic technicians with the USGS California Water Science Center conduct high-flow velocity and volume measurements.
Located beside the 91 Freeway, on the border of Riverside and Orange counties, the dam contains little to no water for much of the year. During periods of heavy rain, however, the structure is intended to collect water and prevent flooding along the Santa Ana River. In February 2017, a concrete spillway at the Oroville Dam disintegrated during heavy rains and triggered the evacuation of more than 180,000 people.
Col. Aaron Barta said the retrofit operations on the spillways at both dams could begin as early as 2021. In the meantime, both the Prado and Whittier Narrows dams continue to be fully functional and operable during storm events, said Dena O’Dell, a spokeswoman for the agency.
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