Slick Willie Caddis

A modern caddis larva imitation designed for euro nymphing with a sleek profile and ice dub body. The partridge legs add realistic movement while the UV coating provides durability and a natural shine. Effective in technical presentations and competition fishing.

Slick Willie Caddis fly pattern - imitates Caddis Larvae, Caddis Pupae tied for Trout
  • Intermediate
  • Spring, Summer, Fall
  • Trout
  • Size 14

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A modern caddis larva imitation designed for euro nymphing with a sleek profile and ice dub body. The partridge legs add realistic movement while the UV coating provides durability and a natural shine. Effective in technical presentations and competition fishing.

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Materials

Hook
Fulling Mill 5045 Jig Force Barbless, size #14
Bead
Fulling Mill Slotted Tungsten, copper, 3.0mm
Thread
UTC Ultrathread 70 Denier, olive
Body
Hareline Caddis Green Ice Dub
Ribbing
UTC Ultra Wire, copper, small
Thorax
Peacock Ice Dub
Wingcase
Thin Skin, mottled oak
Legs
Partridge feather fibers
Coating
Loon UV Clear Fly Finish - Flow

Overview

Developed by Fly Fish Food as a competition-style caddis larva pattern. The combination of ice dub and UV coating creates a translucent, segmented body that mimics the natural appearance of caddis larvae. The partridge legs and wing case add realism without bulk, maintaining the slim profile essential for euro nymphing. Tie in various colors to match local caddis species.

Related patterns

Behavior & presentation

Natural Behavior
Free-living caddis larvae crawl across substrate hunting prey, becoming vulnerable when swept into drift during pupation migrations.
Where Trout Eat It
Fish hold near bottom in feeding lanes 3-5 feet deep, intercepting drifting larvae in pocket water and seams.
How to Fish It
Dead drift with euro techniques. Tungsten bead reaches feeding depth quickly in pocket water while maintaining bottom contact.
Best Water
Target seams along current breaks, pocket water with broken flows, and the heads of pools where larvae concentrate in drift.
Strike Type
Tick or pause in sighter material. Partridge legs create subtle movement triggering visual takes.

Fishing strategy

Rigging Suggestions
Fish on a 9-12 foot euro nymphing leader with 4X-5X fluorocarbon tippet. Use as a point fly in a two-fly rig with a lighter pattern as dropper.
Seasonal Timing
and summer when caddis larvae are active, typically March through September. Fall can also be productive as larvae prepare for pupation.
Pro Tips
Sinks quickly with the 3.0mm tungsten bead, reaching depths of 3-5 feet effectively. The ice dub body creates subtle flash and translucency that attracts trout without spooking them.
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

Free-living caddis larvae actively crawl across streambed substrates, hunting for smaller invertebrates or scraping algae depending on species-specific feeding guilds. These larvae become exceptionally vulnerable during pupation migrations when they must abandon protective microhabitats to attach to stable substrates, creating predictable feeding lanes that experienced trout patrol systematically.

Order
Trichoptera
Common name
Caddisfly
Organism
insect
Life stage
larva

Pattern details

  • Moving Water
  • Worldwide
  • Rocky Mountain
  • tight-line-nymph
  • competition
  • dead-drift
  • caddis-hatch
  • modern
  • searching-pattern
  • low-clear-water
  • tailwater
  • freestone