Mark Decena, director of the documentary "Watershed." Courtesy The Redford Center/Kontent Films A close-up view of the Colorado River, which is featured in the documentary "Watershed." The movie screens Tuesday, Aug. 28, at the City Library auditorium in Salt Lake City. Courtesy The Redford Center/Kontent Films James Redford, one of the producers of the documentary "Watershed." Courtesy of The Redford Center