I have really good luck using "Terrestrials" aka "Garden Hackle" when the rivers start to color up after the first good spring rain. Fished tight to the bank, and in the brush, they can be killer. Also work good on some of the late fish in really deep eddy type holes. A little tip that works for me is to put a little chartreuse and flame yarn under a snell, then hook the garden hackle through the collar, and use a very light split shot about 20 inches up the main line. If there is a metal head lurking in a shadowy area of the hole, hang on, as they will whack the snot out of it. Doesn't hurt to use an inflator or hypodermic to pump a little air in them, and make them buoyant. Tight Lines