San Diego River Park Foundation’s 20th Annual River Days Celebration are going on now through the 21st, celebrating the San Diego River as a cultural, ecological, and recreational treasure. All activities are free and include hikes, clean-ups, nature walks, and educational opportunities. Sarah Hutmacher, Chief Operating Officer for the San Diego River Park Foundation, and Craig Gustafson, Program Manager for Think Blue San Diego, discuss the importance of preserving the San Diego River, and share some surprising facts about pollution.