There are 41 million acre feet of reservoir in California. The 10 largest reservoirs account for over half that, and the top 50 account for 90%. The unlisted re

There are 41 million acre feet of reservoir in California. The 10 largest reservoirs account for over half that, and the top 50 account for 90%. The unlisted reservoirs beyond the 250 in the table don;t account for much storage. The big 10 million plus acre feet reservoirs average 60 years old.