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The California Delta

 
 
 

More than half of all Californians rely on a single source for fresh water: the California Delta estuary.

Once an inland sea, it’s estimated that 7 million acre-feet of water flows through the California Delta estuary each year.

• Provides water to more than half of California’s population

• 26 rivers, 75,000 square miles

• 750 known species of plants and animals

• Supports the massive migratory bird populations of the Pacific Flyway

• Home to three runs of critically endangered wild salmon

• Part of the world’s largest water conveyance system

This map from 1873 shows the California Delta in gray east of San Francisco Bay.