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 fourth blog of the series below.

The mighty Colorado, the life and soul of the West, is one of the most tapped rivers in the world. Can it be saved?

View the full photo essay.

More from this series: