The winter worm is a modified Vladi worm and is a favorite of large rainbow trout in spring. The UV pink version is the only san juan worm pattern I fish on larger rivers these days.
Imitates: You guessed it, worms! Best when flows are high and better when water is slightly off color.
Useful for: River nymph fishing in rivers and streams. A great attractor to toss on when all else fails. They may not eat the worm but it sure does draw attention to that second nymph.
Tricks/Techniques: Best fished from late winter as soon as runoff begins through summer until the water slows and warms. Great to fish under an indicator in line above a smaller nymph or as a dropper above a heavy stonefly nymph. Extra weight is often needed since the fly weighs very little in faster rivers.
This fly is hand tied at my own bench in the United States of America under the highest of scrutiny. A tested and proven pattern.