There are 2,000 miles of high-quality trout streams in the Greater Yellowstone region. Nowhere else in the world is there such a concentration of high-quality salmonid waters. Within Yellowstone National Park alone, there are over forty-five streams and at least forty lakes hosting trout. In this book, licensed Montana and Yellowstone National Park fishing guide Paul Weamer shares with readers fifty essential flies from guides and other experts around the region. Detailed recipes and photos are included for each fly as well as fishing tips and other information. This book is an invaluable resource for anyone planning to visit the area as well as for residents who want to learn how to catch more fish in their local waters.