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Matt Fry, a biologist with Ouray National Fish Hatchery in northeast Utah, raises endangered fish including two that live in the Colorado River Basin – the bonytail sucker and the razorback sucker. (Photo/Luke Runyon)

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The Colorado River is one of the most engineered river systems in the world. Over millions of years, the creatures that call the river home have adapted to the natural variability of its seasonal highs and lows. But for the past century, they have struggled to keep up with rapid changes in the river’s flows and ecology.

By Luke Runyon/KUNC, Cronkite News January 5, 2021