Patterned after a classic North Country spider, the Partridge and Light Cahill is another example of a fly that is ridiculously simple and devastatingly effective. The first time I tied this fly, it sat in my box, unused, for the better part of four years. Then came a late May evening on the lower Farmington. Creamy mayfly duns were out in force. Trout were slashing at the flies, their feeding frenzy creating a cauldron effect on the river’s surface. I tied my experiment onto my team of three wets, and the trout overwhelmingly showed their approval. To the vise, good angler, then fish the Light Cahill and Sulphur hatches with confidence. The vote will surely be yes for you, too.