Some US states and Mexico must cut their water usage to avoid "catastrophic collapse" of the Colorado River, Washington officials said on Tuesday (Aug 16), as a historic drought bites.

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More than two decades of well below average rainfall have left the river - the lifeblood of the western United States - at critical levels, as human-caused climate change worsens the natural drought cycle.

Despite years of warnings, states that depend on the river have not managed to reduce their demands enough, and on Tuesday, the federal government said it was imposing cuts.

"In order to avoid a catastrophic collapse of the Colorado River System and a future of uncertainty and conflict, water use in the Basin must be reduced," said Tanya Trujillo, Assistant Secretary for Water and Science at the Interior Department.

Arizona's allocation from the river will fall by 21 per cent in 2023, while Nevada will get eight per cent less. Mexico's allotment will drop by seven per cent.

California, the biggest user of the river's water and the most populous of the western states, will not be affected next year.

The Colorado River rises in the Rocky Mountains and snakes its way through Colorado, Utah, Arizona, Nevada, California and northern Mexico, where it empties into the Gulf of California.