As of Thursday, the California Department of Water Resources' data showed the current water level at Lake Oroville was 69% of its capacity on Wednesday — up from 28% just two months ago. The State Water Project is a network of reservoirs, canals, and dams that supplies water to 27 million people. 

Last summer, Lake Oroville's water levels fell dangerously low (read: here & here). But a conveyor belt of atmospheric rivers dumped trillions of gallons of rain on the state early this year that helped fill up the once drought-stricken reservoir.