Sally Sierer Bethea was one of the first women in America to become a "riverkeeper"-a vocal defender of a specific waterway who holds polluters accountable. In Keeping the Chattahoochee, she tells stories that range from joyous and funny to frustrating-even alarming-to illustrate what it takes to save an endangered river. Her tales are triggered by the regular walks she takes through a forest to the Chattahoochee over the course of a year, finding solace and kinship in nature. For two decades, Bethea worked to restore the neglected Chattahoochee, which provides drinking water and...