The San Diego County Water Authority will begin aqueduct maintenance next spring, with the $66 million project expected to be complete in summer 2026. The project area will include pipelines that run through Rancho Bernardo and Poway.

The Southern First Aqueduct Facilities Improvement Project will focus on 99 aqueduct support structures in streets, along access roads and within utility easements. There are two 48-inch- and 54-inch-diameter critical regional pipelines involved, officials said.

The plan is for one pipeline to be taken offline at a time, according to engineering manager Brent Fountain, who spoke at the Rancho Bernardo Planning Board’s Oct. 19 meeting. The project is “very proactive” because it will be replacing some of the concrete vault structures and doing other infrastructure work to components, such as air vents and pump wells, before it becomes absolutely necessary, Fountain said.