The truth of the matter is that you really need only one worm fly: the classic San Juan. Good luck finding a long rodder, from streamer junkies to dry-fly purists, who doesn’t have a San Juan or two in his or her box as a back-up. Because when all else fails, a 20-pound steelhead, a 12-inch stockie, and a 6-inch wild brook trout will all scarf down this simple worm. Best of all, even a kinda-sorta decent fly-tier can knock out this pattern in less than a minute. It is arguably one of the easiest bugs you’ll ever spin, making it great for beginners itching to score a fish on a homemade fly. San Juan styles are nearly endless, too; change the length, chenille thickness, and color to match your target’s appetite and size, or to match the water conditions. In low water, you can drift a worm weightless, letting it ride just below the surface. In high, dirty water, sink it with some split shot and dredge up a monster.