NymphintermediateRocky Mountain West
WD-40
Flybox sourcing profile
No TWG price or checkout is active. Use this page to validate the fly, then source it through the mapped tier or trusted fly shops.
Available Sizes#18 - #24
Color Variations
OliveGrayTanBlack
Pattern Ledger
Source WD-40
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Sourcing Ledger
Where to source this pattern
TWG checkout is closed. These are current sourcing leads, scored by mapped tier, region, species, fly type, and named-pattern evidence. Confirm availability directly with the tier or shop.
Signature tierStrong match
Rocky Mountain Fly Design
Matched on Rocky Mountain West, nymph flies, trout. Colorado tier and shop lead for Rocky Mountain trout, bass, and predator patterns.
Rocky Mountain Westnymph fliestrout
Visit sourceRegional shopStrong match
Taos Fly Shop
Matched on Rocky Mountain West, nymph flies, trout. New Mexico/Southwest trout shop lead for Rio Grande, San Juan, Pecos, and high desert water.
Rocky Mountain Westnymph fliestrout
Visit sourceSignature tierStrong match
Stillwater Fly Fishing Store
Matched on Rocky Mountain West, nymph flies, trout. Specialist stillwater source for balanced leeches, chironomids, and lake-trout logic.
Rocky Mountain Westnymph fliestrout
Visit sourceBroad sourceStrong match
Fly Fish Food
Matched on nymph flies, trout, midge. Strong technical tying and trout catalog coverage, especially nymphs, dries, and stillwater flies.
nymph fliestroutmidge
Visit sourceBroad sourceStrong match
Fulling Mill Flies
Matched on nymph flies, trout, dry. Large pattern house with broad freshwater and saltwater fly categories.
nymph fliestroutdry
Visit sourceNamed not after the lubricant but after the principle that some problems require a universal solvent. The WD-40 was created on Colorado's South Platte to address the daily crisis of selective trout eating tiny things you cannot see. It imitates emerging midges and small mayflies with a thread body and a wisp of mallard flank, and it works with the reliable consistency of the product it was named after. When the fishing is difficult and your ego is bruised, tie on a WD-40 and quietly get back to work.
Quick Facts
TypeNymph
Difficultyintermediate
SeasonsSpring, Fall, Winter
Target SpeciesRainbow Trout, Brown Trout
Sizes#18 - #24
Best LocationsSouth Platte River, CO; Frying Pan River, CO; San Juan River, NM
Where to Fish It
South Platte River
CO · Tailwater
Frying Pan River
CO · Tailwater
San Juan River
NM · Tailwater
Map unavailable. Locations for WD-40: South Platte River, CO; Frying Pan River, CO; San Juan River, NM
Related Reading
hatch guide
Midge Fishing: The Tiny Flies That Save the Day
When every other hatch has shut down, midges keep trout feeding. From winter tailwaters to high-altitude stillwaters, Chironomidae are the most abundant insects in freshwater ecosystems. Learning to fish these tiny patterns unlocks twelve months of dry-fly and nymphing opportunities.
seasonal playbook
The Winter Guide: Cold Water, Warm Hands, Willing Fish
Winter separates the dedicated from the fair-weather crowd. The rivers are empty, the hatches are tiny, and the fish feed in slow motion. But they do feed — they have to. And the angler who understands cold-water metabolism, midge biology, and the art of slowing down will find winter fishing not just productive but deeply rewarding.
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