I cannot think of anyone more dedicated to or passionate about the Colorado River than my friend pedromcbride. His book, Witness to Water, comes out today and follows a lifelong love affair with one of Earth’s mightiest waterways. But the Colorado does not flow as it once did, carving its way across the American Southwest toward Mexico. Today, it rarely reaches the sea, and its fate is deeply intertwined with countless species alongside the lives of more than 40 million people. Visit the link in my bio to get your copy (available in bookstores too!) and see the river through the eyes of its most devoted champion. Pete is grateful to friends kevinfedarkoauthor, NYT-bestselling writer of A Walk in the Park, and Dr. Len Necefer, founder of nativesoutdoors (lennecefer), for their guest essays. Video and photos by #PeteMcBride