With over 500 fly patterns from Idaho, Montana, Wyoming and more western states, this all-encompassing guide is a must-have for avid fly fishermen. With accurate recipes and detailed pattern instructions, this reference book for the Rocky Mountains will provide tiers with everything they need to fish inside and around Yellowstone. Covering nymphs, dry flies, emergers, streamers and many more, the flies in this guide will help anyone looking to enhance their fishing experience in the west.