"Somebody just back of you while you are fishing is as bad as someone looking over your shoulder while you write a letter to your girl." -- Ernest Hemingway.
Let's be considerate of each other out on our rivers and lakes. Here is a "A basic outline of etiquette rules to help the wade & float fishing angler " provided by the Colorado Cutthroat Chapter of Trout Unlimited (www.cutthroatctu.org). See the detailed list here at this Colorado Parks site.
Want to read fly fishing etiquette from the 15th Century? Check out the Angler's Field Guide!
Fly Fishing Colorado offers these guidelines for etiquette.
Orvis 101 Introduction to Fly Fishing
Early season stillwater Fundamentals-Classroom