CDC Downey Wonder Nymph

The CDC Downey Wonder Nymph is an effective pattern that imitates a variety of aquatic insects in their nymphal stage. The use of CDC feathers gives the fly a lifelike movement in the water, making it irresistible to trout.

CDC Downey Wonder Nymph fly pattern - imitates Aquatic Insects tied for Trout
  • Intermediate
  • Spring, Summer, Fall
  • Trout
  • Size 12–16

Watch it tied

One video
Trigger NymphNext flyBarry's Carp BitterNext flyDouble StandardNext flyZug BugNext fly

The CDC Downey Wonder Nymph is an effective pattern that imitates a variety of aquatic insects in their nymphal stage. The use of CDC feathers gives the fly a lifelike movement in the water, making it irresistible to trout.

More Nymphs

See all

Materials

Hook
Tiemco 3769, size #12-#16
Thread
Olive Dun 8/0
Bead
Copper, 2.5mm
Tail
Coq de Leon
Body
Olive dubbing
Ribbing
Copper wire
Thorax
Peacock herl
Wingcase
CDC feathers

Overview

This soft, buggy nymph uses CDC in the thorax and tail to add subtle movement and trap air bubbles, mimicking an emerging insect. Typically tied with a sparse dubbed body and fine wire rib, it's a simple, effective pattern for picky trout in clear water.

Related patterns

Behavior & presentation

Natural Behavior
Dislodged nymphs tumble helplessly through current, their slim profiles rolling erratically as they attempt to regain substrate holds. The natural drift makes them easy targets for opportunistic feeders.
Where Trout Eat It
Fish hold in feeding lanes through runs and pools, intercepting tumbling nymphs at mid-depth where current concentrates drifters.
How to Fish It
Dead drift with the CDC providing subtle movement, occasionally twitching to mimic a struggling nymph trying to swim back to the bottom.
Best Water
Target tail-outs where current slows and nymphs suspend, runs with consistent depth, and pockets below obstructions.
Strike Type
Watch for indicator hesitation, subtle line tightening, or a brief pause in the drift as fish mouth the fly.

Fishing strategy

Rigging Suggestions
Can be used in a tandem nymph rig with a heavier pattern to get it down in the water column.
Seasonal Timing
When trout are feeding subsurface, typically during non-hatch periods.
Pro Tips
This nymph pattern is designed to sink and imitate a struggling nymph. Its slim profile and natural colors make it less visible, but more appealing to trout.
From River & Run

Where to fish it

Rivers anglers pair with this fly, with local shops that stock it.

Open River & Run

River details and fly shops from River & Run, our sister site.

Entomology

Aquatic insect nymphs tumble and drift naturally in currents after being dislodged from their substrate holds, exhibiting erratic swimming motions as they attempt to regain footing on the streambed. Fish opportunistically feed on these dislodged nymphs because they represent calorie-rich meals that require minimal energy expenditure to capture. The irregular drift patterns and vulnerability during these displacement events trigger aggressive feeding responses, especially in faster pocket water and riffles.

Organism
insect
Life stage
general

Pattern details

  • Stillwater
  • Moving Water
  • Rocky Mountain
  • dead-drift
  • indicator-nymph
  • low-clear-water
  • tailwater
  • freestone