Corps, Orange County amend partnership arrangement for Santa Ana River Mainstem task characteristics to improve flood defense

LOS ANGELES — The U.S. Army Corps of Engineers Los Angeles District and the Orange…

The U.S. Army Corps of Engineers Los Angeles District and the Orange County Flood Command District are delighted to announce the signing of an modification to use Bipartisan Budget Act of 2018 money for find options of the Santa Ana River Mainstem venture, built to increase flood defense for a lot more than 1 million folks.

The $2.83 billion Santa Ana River Mainstem project is aimed at lessening threat of flood harm along the Santa Ana River’s 96-mile journey, from 7 Oaks Dam in the vicinity of San Bernardino to Huntington Seashore, the place it flows into the Pacific Ocean.

The amendment to the challenge cooperation settlement among the two companies was signed Oct. 7 by Col. Julie Balten, LA District commander, and Oct. 6 by Michelle Metal, chairwoman of the Orange County Board of Supervisors.

The amended arrangement makes it possible for the Corps to use federal funds underneath the Bipartisan Spending budget Act to complete choose remaining features, which involve boosting the Prado Dam spillway by 20 feet, from an elevation of 543 toes to 563 toes completing the lessen Norco Bluffs toe security job, and the Alcoa Stage 2 and River Highway dikes and ongoing mitigation tasks related with the Prado Dam undertaking functions.

“We are fired up about our continued partnership with the Orange County Flood Control District on this particularly significant project,” Balten mentioned. “The Prado Dam lessens the possibility of flooding for much more than 1.4 million people today residing and performing downstream of the dam in 29 metropolitan areas in Riverside and Orange counties and guards extra than $61 billion in home.

“Additionally, the Prado Basin – which encompasses the tri-county spots of Riverside, San Bernardino and Orange counties – gives recreation, drinking water conservation, environmental stewardship and other alternatives that will profit the bordering communities for several years to occur.”

Style for the spillway, Norco Bluffs toe projection and dikes are underway. The Corps estimates development contracts will be awarded in federal fiscal yr 2021.

Completing the basin dikes and raising the spillway will supply an extra 142,000 cubic feet of flood water storage, for a whole of 362,000 cubic ft, which will raise the dam’s capacity to retain drinking water and provide two major rewards – lowering the probability of downstream damage from flood waters and could perhaps boost the means to keep more water to recharge underground storage materials.

“Through this partnership and collaboration, we have taken just one much more action toward significantly enhancing the protection of our communities’ properties, universities, organizations, parks and additional,” Metal stated. “We have made important development in addressing the Santa Ana River improvements, and this agreement will take us to the complete line in completing the components necessary to raise Prado Dam.”

Completion of construction in what is referred to as “Reach 9” of the Santa Ana River, which contains a levee downstream of Prado Dam in the Metropolis of Yorba Linda and the BNSF railway bridge security, are underway and are not aspect of the BBA cash. The levee is intended to offer erosion security for the north financial institution of the Santa Ana River and flood risk administration for parts of East LA Palma Avenue, the Santa Ana River Path/Bikeway, industrial facilities, professional enhancement and household housing. On top of that, original funds from the BBA have been supplied to detect a development-all set challenge for the Santiago Creek aspect.


Construction of the Prado Dam was done in May 1941. Area 401 of the H2o Methods Advancement Act of 1986 later on authorized a comprehensive undertaking for flood possibility administration in the tri-county places of San Bernardino, Riverside and Orange counties, including enhancements to the Prado Dam that furnished for raising the dam and the construction of eight dikes alongside the basin boundaries. This expanded and enlarged effort is referred to as the Santa Ana River Mainstem venture.

The undertaking incorporates quite a few characteristics that have currently been done, including advancements to 7 Oaks Dam, 30 miles of levees and modifications to initial venture characteristics, like boosting the Prado Dam embankment and set up of a new larger sized capacity outlet operates.