The point of Gov. Gavin Newsom’s proposed underground aqueduct is to divert water from the Sacramento River beneath the fragile wetlands, waterways and islands that make up the Sacramento-San Joaquin River Delta to an artificial body of water about 25 miles southwest of Stockton known as Clifton Court Forebay. From there, water would continue to flow through state aqueducts to coastal and Southern California and through federal channels mostly to farm fields in the San Joaquin Valley.
Currently, the water flows not under the delta but right through it. The problem is that when the powerful pumps are running near Clifton Court to drive more water to Southern California and the Central Valley, they reverse the natural flow of delta water and interfere with migrations of endangered fish