This week on Unbottled, we’re paying tribute to the Colorado River – named America’s most endangered river in 2012. Each day, you’ll have an opportunity to learn about this important water source through a series from National Geographic. And you’ll also have a chance to help restore 1,000 gallons to the Colorado River by taking the free pledge. Find out more about Change the Course here and check out our first blog of the series below.

Once teeming with life and spanning some two million acres, the delta of the Colorado River ranked among the planet’s greatest desert deltas. But more than half a century of damming and diverting the river’s flow to supply the burgeoning farms and cities of the American Southwest has dried out the delta’s wetlands and depleted the river. In most years, the mighty Colorado – which sculpted the Grand Canyon – no longer reaches the sea.

Watch the video.

More from this series: