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Colorado River streamflow history reveals megadrought before 1490

An epic drought during the mid-1100s dwarfs any drought previously documented for a region that includes areas of Arizona, Colorado, New Mexico, Utah and Wyoming. The six-decade-long drought was marked by the absence of very wet years and a 25-year period when Colorado River flow averaged 15 percent below normal. The new tree-ring-based reconstruction documents the year-by-year natural variability of streamflows in the upper Colorado River basin back to A. D. 762.

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Keywords: colorado, river, streamflow, history, reveals, megadrought, 1490, reveal

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