Sunset at waterfalls
Horseshoe Bend, Colorado River
Aerial view of canyon
City along a winding river
Woman praying in the Ganges river
Icy tree on river
Colorado river
Glen Canyon and Lake Powell
Rowing on the Rio Negro in Brazil
Colorado River at Lake Powell
Sunrise on river
Silhouetted Trees on Mississippi River
Zambezi River footbridge
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Photograph by Scottyboipdx Weber, Your Shot

Rivers

The steady flow of the clean, fresh water of rivers is essential to human life and a whole host of aquatic species.

3 min read

Rivers and their tributaries are the veins of the planet, pumping freshwater to wetlands and lakes and out to sea. They flush nutrients through aquatic ecosystems, keeping thousands of species alive, and help sustain fisheries worth billions of dollars.

Rivers are also the lifeblood of human civilizations. They supply water to cities, farms, and factories. Rivers carve shipping routes around the globe, and provide us with food, recreation, and energy.

Hydroelectric plants built from bank to bank harness the power of water and convert it to electricity.

But rivers are also often the endpoint for much of our industrial and urban pollution and runoff. When it rains, chemical fertilizer and animal waste peppering residential areas and agricultural lands is swept into local streams, rivers, and other bodies of water.

The result: polluted drinking water sources and the decline of aquatic species, in addition to coastal dead zones caused by fertilizer and sewage overload.

Over the course of human history, waterways have been manipulated for irrigation, urban development, navigation, and energy. Dams and levees now alter their flow, interrupting natural fluctuations and the breeding and feeding patterns of fish and other river creatures.

Technology and engineering have changed the course of nature, and now we are looking for ways to restore flow and function to the planet’s circulatory system.

The Colorado River provides an excellent example of what happens when demand for river water—for cities, industry, energy production, and agriculture—threatens to outpace supply.

River Trivia

  • An unsettling number of large rivers—including the Colorado, Rio Grande, Yellow, Indus, Ganges, Amu Darya, Murray, and Nile—are now so overtapped that they discharge little or no water to the sea for months at a time.

  • The world's biggest dam, the The Three Gorges dam on China's Yangtze River, is one of the largest power generators in the world, and holds almost 32 million acre-feet (39.3 cubic kilometers) of water. The hydropower-generating dam does have its drawbacks, though: It displaced an estimated 1.3 million people and flooded thousands of villages.

  • After enduring 19 flood episodes between 1961 and 1997, Napa, California, opted to restore the Napa River floodplain for $366 million, instead of the more conventional flood-control strategy of channelizing and building levees. (See the nearby Oroville Dam's slipway bursting at the seams.)

Rivers Run Dry From Overuse

the dry riverbed of the Colorado River
an aerial view of the Colorado River reservoir and fields near Meeker
a hunter wears a bird as a hat in the Indus River
a man in boat near bridge on Indus River
three small figures near banks of the Amu Darya
an aerial view of the Syr Darya River near Tashkent
the Rio Grande River with blue sky and clouds
algae in the Rio Grande and Arroyo San Carlos
The Yellow River runs next to the Great Wall of China
A crowd watches rushing water
Men with boats planting rice in Teesta River
drought-stricken trees near the Murray River
the mouth of the Murray River
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Colorado RiverBeautiful tendrils fill the now dry Colorado River delta.
Photograph by Peter McBride, Nat Geo Image Collection

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