By the numbers

Amid four years of drought, reservoir levels have plunged across California. These dams are typically a small but important producer of power.

Reservoir levels at some major California dams:


Shasta: 50%

Trinity: 36%

Folsom: 54%

New Melones: 8%

Californians are less reliant on hydropower than in previous decades. The percentage of the state's energy supply that comes from hydropower:

1950s: 60%

Today: 14% to 19%

Source: U.S. Bureau of Reclamation, California Energy Commission