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Negotiations over the water supply for 40 million people are hinged on how you interpret the words "will not cause," written into the century-old Colorado River Compact.
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Cities around Phoenix are spending billions to develop water infrastructure. Local leaders say it's a necessary step as the Colorado River shrinks and groundwater dries up.
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State, federal and tribal leaders met in Boulder, Colo. to talk about the Colorado River's next chapter. They don't appear close to an agreement.
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Some experts say the System Conservation Pilot Program, or SCPP, is costly and may not be the most effective way to save Colorado River water.
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States tasked with deciding the Colorado River's future have submitted competing proposals for how to manage the river's water. Environmental groups and tribes are also trying to help shape that conversation.
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A new study from University of Colorado Boulder researchers finds a strong chance that precipitation will make the next two decades on the Colorado River wetter than the last.
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A group of tribes that use Colorado River water sent a list of principles to the federal government amid contentious talks about how to share the shrinking supply.
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Colorado's Rocky Mountains have reached peak snowpack, but climate change is changing the way snow turns to water. States around the region are debating new rules for the river that center around new water deficits.
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Newly discovered damage to part of the dam holding back America's second-largest reservoir has people who rely on the Colorado River worried about their ability to get the water they need.
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Damage inside Glen Canyon Dam could mean problems with the "river outlet works," a set of small tubes near the bottom of the dam that were originally intended to release excess water when the reservoir is nearing full capacity. The dam allows water to pass through to the Colorado River and Grand Canyon.