The award-winning Hauck Mesa Storage Reservoir enhances drinking water supply reliability and operational efficiency for the region. Construction was completed June 23 on the San Diego County Water Authority project in North San Diego County.

Work started in March 2021 with the demolition of an out-of-service steel tank.

Project work included construction of an underground isolation vault and flow control facility, in addition to a new 2.1 million-gallon water tank connected to the Valley Center Pipeline.

Improved operational flexibility

Operational flexibility is increased at Hauck Mesa by balancing the flow of treated water between the agency’s First and Second Aqueducts and by helping to maintain water deliveries if power supplies are interrupted. The new storage reservoir enhances the Water Authority’s ability to provide reliable and efficient deliveries of treated water to member agencies.

The walls of the new tank are about 60 feet tall, stained a forest green color to blend in with the natural landscape, and made of prestressed, or wire wrapped, concrete.

“The prestressed technology will maintain the tank walls in permanent compression, allowing the tank to accommodate seismic events while remaining watertight,” said Water Authority Construction Manager Emma Ward-McNally.

The project reached a major milestone in April 2022 when crews poured the concrete roof of the new prestressed concrete water tank. The entire system, including the new tank and flow control facility, was put into service in May 2023.

Award-winning Hauck Mesa Storage Reservoir project

The Hauck Mesa Storage Reservoir project has received two awards: The 2023 Honor Award from the American Public Works Association for Utilities in the $6 – $25 million category and was a joint winner of the 2023 Outstanding Water Project from the American Society of Civil Engineers.

Strategic infrastructure improvements by the Water Authority and its member agencies are part of the regional effort to ensure continued delivery of water to support the region’s $268 billion economy and the quality of life for 3.3 million residents. As part of the asset management program, it is critical to actively replace and repair the Water Authority’s assets, which include pipes, valves, facilities, equipment, and other infrastructure.

Collaboration with Valley Center Municipal Water District

During construction, the Water Authority worked closely with the Valley Center community, Valley Center Municipal Water District, and nearby homeowners to minimize short-term construction impacts during the project.

The Water Authority operates and maintains a regional water delivery system capable of delivering 900 million gallons of water per day. Building and operating the large-scale infrastructure required to meet the region’s water needs now and in the future requires careful planning and technical expertise. The Water Authority uses a sophisticated approach to cost-effectively build, operate, maintain and secure its water facilities as an integrated system.

(Editor’s note: The Valley Center Municipal Water District is one of the San Diego County Water Authority’s 24 member agencies that deliver water across the San Diego County region.)