Who uses the most water from Colorado River?

California — with the largest allocation of water from the river — is the lone holdout. Officials said the state would release its own plan. The Colorado River and its tributaries pass through seven states and into Mexico, serving 40 million people and a $5 billion-a-year agricultural industry.



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About 85–90 percent of the Colorado River's discharge originates in melting snowpack from the Rocky Mountains of Colorado and Wyoming. The three major upper tributaries of the Colorado – the snow-fed Gunnison, Green, and San Juan – alone deliver almost 9 million acre-feet (11 km3) per year to the main stem.

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The Colorado River is an important water resource for areas outside of the basin, including Denver, Salt Lake City, Albuquerque, Los Angeles, and San Diego for public (municipal) supply, and the Imperial Valley in California for agricultural water supplies.

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The three “Lower Basin” states also receive 7.5 million acre-feet. Of that, California has the right to take up to 4.4 million acre-feet from the river each year; because they have the oldest legal rights to the river, Californians are also the last to see cuts during drought.

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Only about 10 percent of all the water that flows into the Colorado River makes it into Mexico and most of that is used by the Mexican people for farming.

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If the water levels dip much lower, the Colorado's northernmost reservoir won't have enough in the tank to both fill Lake Mead downstream and generate any hydropower, which would have devastating effects on the electricity grid in the western US.

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Electricity would not just be the only thing lost. Without Lake Mead, Las Vegas would lose access to 90 percent of its water sources. If Lake Mead were to reach dead pool, it would technically still be able to supply drinking water to Las Vegas. But there will not be enough water for agricultural activities.

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The Colorado River is drying up due to a combination of chronic overuse of water resources and a historic drought. The dry period has lasted more than two decades, spurred by a warming climate primarily due to humans burning fossil fuels.

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Using this measure the Mississippi River is the 15th largest river in the world discharging 16,792 cubic meters (593,003 cubic feet) of water per second into the Gulf of Mexico.

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