This book is fine if you want to go to one of the 6 or 8 most famous trout streams in CA, but if you want to try one of the several thousand other places to fish, it has nothing. A much more complete reference is "California Fishing" by Tom Stienstra. While it isn't fly-fishing specific, it is a much more comprehensive book, and rates places based not only on the fishing, but on camping spots, number of people, and scenic beauty, which are at least as important as the fishing, in my opinion. Stienstra's book also includes detailed maps and directions to the places it reviews.Ditch this book and pick up Tom Stienstra's instead.