Really Mark, this is a flyfishing site.

John, on eastern waters with a a fair number of people fishing, if you can get thirty yards id be satisfied with that. If you consider most peope cant ( and probably shouldnt ) cast more than 50 ft accurately, 30 yards should give you a safe margin. On western waters iwould think a hundred yards should keep most happy.
What gets me is when no one else seems to be in the area and someone comes up on you and starts fishing close. Of course, you could view it as an opportunity to catch the heck out of them and frustrate the other person.��