Here are a Few Reservoirs that are Helping Us in California
This link will take you to a map of the Hetch Hetchy Reservoir. It is used by over 2.6 million people. The Hetch Hetchy Reservoir has helped a lot by holding about 117 billion gallons of water for the drought in California. The Hetch Hetchy Reservoir gets its water from the nearby snow melt off the mountains. It melts and flows into the reservoir.
This link will take you to a map of the Lake Shasta Reservoir. It is helpful to it's nearby residents and is currently holding about 1,100,000 gallons of water.
This link will take you to a map of the Folsom Lake Reservoir. The Folsom Lake Reservoir can hold up to 977,000 gallons of water but now is currently holding about 324,000 gallons of water.