This book investigates the vital role of California's rivers, exploring their ecological significance, historical impact, and the challenges they face. Tim Palmer, an acclaimed environmental writer and photographer, draws upon decades of experience documenting North American waterways. The book syntheses extensive field research, historical accounts, and ecological data to present a comprehensive argument for the preservation and understanding of these crucial water systems. Palmer's work highlights the intricate connections between the rivers, the landscapes they shape, and the human communities that depend on them.

This work is recognized for its authoritative blend of scientific rigor and evocative prose, appealing to both environmentalists and general readers interested in California's natural heritage. Palmer's deep knowledge of his subject and his commitment to firsthand observation lend significant weight to his arguments. The book is considered a valuable resource for understanding the complex relationship between water, land, and human activity in the state.