Wow. If you are looking for the tell all book for flyfishing Wyoming....you found it. To say that this book is comprehensive does not do it true justice. It covers every single stretch of water worth throwing a line into. In addition, it gives seasonal water informaiton including flows, hatches, and species. If you live in the west, or if you dream of fishing there, this book is a MUST OWN. I think to fish Wyoming without reading it would be a waste of your time.