Mavis Caddis: Nymph Flies for Colorado.
Mavis Caddis: A Caddis Nymph Pattern for fly fishing the Cache La Poudre and Big Thompson. On both of these rivers the caddis hatch is the strongest in May and June. This is a great nymph pattern to use on a dry dropper set up or on a double nymph rig. Our fly fishing guides love this pattern. With the black tungsten bead head this fly gets down fast to where the trout are feeding.