Getting Down Pattern choice matters, but presentation is the real key. "You need to put the nymph 4 to 8 inches above bottom, as the fish aren't inclined to dig something off the bottom," Johnson says. That means adding weight to your line. An unweighted fly moves more naturally than a weighted one, so he uses a slinky weight attached to the leader butt (see inset above). The setup lets you easily change the weight as river conditions dictate; Johnson notes that every pool or run may require an adjustment.