When stream fishing for trout and salmon you want to cast across the stream and let your bait drift down with the current barely "ticking" the bottom. In this way, it will go down where the fish are and still not get snagged. Start by pulling one or two round split shot on the trailing line. When you feel the bottom as your bait drifts down you're at the right depth. If not add one shot at a time until you "tick" bottom.