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Based on “Colorado”.

More than half of the Colorado River originates underground

A U.S. Geological Survey shows that a little more than half of the Colorado River, the West’s primary water source, is groundwater before it seeps into the river bed. The preliminary finding may help city water supply managers anticipate future volumes amid rising temperatures and less snowfall.

EPA machinery causes major spill in Colorado

Heavy machinery the Environmental Protection Agency (EPA) used to investigate pollutants at the Gold King Mine accidentally released an estimated one million gallons of mining waste into a creek, causing the Animas River north of Silverton, Colorado to turn an opaque orange.