In this week’s “How to Tie” feature, Hans Weilenmann ties a variation of AK Best’s Spent Caddis, a simple caddis dry that will trick picky trout during and after large hatches.
Learn How to Tie This Fly:
Difficulty: Easy
The spent caddis is one of the most overlooked but deadly dry flies in a trout angler’s box. When caddis return to the water to lay eggs or die off after a hatch, trout often feed with slow, deliberate confidence. This variation of AK Best’s Spent Caddis perfectly imitates this vulnerable stage with a slim profile, splayed wings, and a flush-floating posture that will fool even the pickiest fish this summer.
Focus on proportion and material control while tying this spent caddis. You’ll be rewarded for subtlety, so keeping the dubbed body slim and avoid over‑dressing the wing will produce an irresistible silhouette. Use light thread tension when securing the mallard feather to allow for adjustments of length, and for additional support you can trim the underside of the hackle to help the fly sit flush on the surface. Be patient while creating the profile as this is key to imitating these vulnerable caddis, but don’t overthink it as natural materials will often do much of the work for you on the water.
When fishing this spent caddis, think subtle, slow, and deliberate. This pattern shines during calm evening drifts when trout are sipping spent adults with barely a ripple, so focus on long leaders, fine tippet, and drag free drifts that let the fly land softly and sit motionless. Targeting soft seams, tailouts, and the edges of bubble lines where spent caddis naturally collect will produce fish and is very important for making the best use of your time. When fishing trout rivers and streams this summer, be sure to make some room in your dry fly box for this variation of AK Best’s Spent Caddis.
Ingredients:
- Hook: Light Barbless Dry Fly Hook #8-16
- Thread: Danville 6/0 – Tan
- Wing: Mallard Feather – Small, Dyed Tea Color
- Body: Australian Opossum
- Hackle: Cock, Cree
Now you know how to tie a Spent Caddis!
Video courtesy of Hans Weilenmann.
Last Updated on May 26, 2026 by Max Inchausti
