This relatively recent pattern was tied for Western waters but is effective just about everywhere. Search pocket water and fast currents with this pattern-it’s practically unsinkable-and don’t be afraid to use a big one, even in smaller streams. Though a first-rate attractor, a Stimulator can imitate a variety of insects. The broad silhouette and bushy wing mimic the blocky body and fluttering wings of an adult stonefly. Use smaller sizes during a caddis hatch. In late summer, plop it hard on bankside water during grasshopper season.