The U.S. Bureau of Reclamation will release less water from Nimbus Dam to the lower American River due to the dry winter conditions.
Flows in the river will go from 1100 cubic feet per second down to 500 cubic feet per second by Friday. The Bureau says the reduction is needed to protect fish and drinking water behind Folsom Dam.
The water content of the Sierra snowpack is about 20 percent of average for this time of year. California estimates it will only be able to deliver 5 percent of the water requested by 29 public agencies this year.
Record summer heat has increased fire risk in California and the Western U.S. as drought conditions expand.
Statewide water conservation exceeded the mandatory goal in May and Sacramento reduced water use 40 percent.
In the fourth year of drought in California, sales and use of "safe and sane" fireworks are restricted in some areas, allowed in others.
A California Assembly committee will hear a bill Wednesday that would allow water districts to impose taxes on any business, industry or person who wastes water.
The drought can be blamed for a number of problems and the latest is a major decline in the duck population. A new survey shows lack of rain has led to poor habitats.