What if you could peer into the fly boxes of the guides who make their living helping people catch fish, day in and day out? With this comprehensive guide to the best patterns for Colorado rivers and reservoirs, now you can. Not only are these patterns effective for Colorado, but anglers from around the world will discover new flies for their home waters. *600 patterns from the state's top guides and fly tiers* Complete hatch information for the state* Interviews with 20 of the state's top guides