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The Dark Cahill dry fly is a classic pattern designed to imitate the adult stage of various mayflies, especially those that hatch in the evening or under low light conditions. It’s a versatile fly that works well in many different waters, making it a favorite for targeting trout.

Materials Used:

• Hook: Standard dry fly hook, typically sizes 12-18 (e.g., Mustad R50-94840 or TMC 100).
• Thread: Black or dark brown, 6/0 or 8/0.
• Tail: Dark ginger or dark brown hackle fibers, tied sparsely.
• Body: Dark brown or dark gray dubbing, often made of natural fur like muskrat or fine synthetic material.
• Wings: Paired upright wings made from dark gray duck quill segments or similar materials to imitate the natural wing silhouette.
• Hackle: Dark ginger or brown rooster hackle, palmered around the hook near the wings.

Target Trout:

The Dark Cahill is effective for a variety of trout species, especially:

• Brown Trout
• Rainbow Trout
• Brook Trout
• Cutthroat Trout

This fly pattern is particularly useful during evening hatches of dark-bodied mayflies. It’s often fished in slow to moderate currents, where its natural drift can entice surface-feeding trout.