By David A. Lieb, Michael Casey and Michelle Minkoff, Associated Press
Constructed four generations ago, the massive rock and clay dam at El Capitan Reservoir is capable of storing over 36 billion gallons of water, enough to supply every resident in San Diego for most of a year.
Great Lakes Now
https://www.greatlakesnow.org/2022/05/ap-analysis-growing-number-of-dams/