Discover 10 fascinating facts about the Colorado River, its history, beauty, and vital role!

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Formerly Grand River

Until 1921, the river flowing from the Rockies to Utah's desert was called the Grand River, merging with the Green River as the Colorado.

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Living Entity

Indigenous peoples have cherished the Colorado River for millennia. To the Diné, it’s the male river, meeting its female counterpart at the Little Colorado.

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Largest Reservoir

Lake Mead, formed by Hoover Dam in 1936, is the largest U.S. reservoir, holding 9.3 trillion gallons when full, east of Las Vegas.

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Losing River

The Colorado River’s extensive dams and diversions remove more water than flows in, leaving it unable to reach the sea anymore.

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Among Longest Rivers

The Colorado River spans 1,450 miles, winding through 7 states and 11 national parks, shaping the landscapes of the American West.

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Diverse Wildlife Habitat

The Colorado River supports diverse wildlife, from elk in alpine areas to mountain sheep and coyotes in arid regions, plus many bird species.

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Valuable Resource

Serving 40 million people, the Colorado River powers irrigation, water supplies, and hydropower, with 75% used for agriculture.

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Abundant Recreation

The Colorado River offers rafting and kayaking thrills in spots like Westwater and Cataract Canyons, and the iconic Grand Canyon.

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Top Whitewater Rafting

Whitewater adventures abound on the Colorado River, with rafting in Gore Canyon and scenic floats in mellower, wide sections upstream.

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Colorado River States

Flowing through 7 states, the Colorado River starts in the Rockies and forms part of the U.S.–Mexico border for 17 miles.

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