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Copper JohnNymphbeginner

Rocky Mountain West

Copper John

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#12 - #20
Color Variations
CopperRedChartreuseBlack

Pattern Ledger

Source Copper John

Want help finding this exact pattern or a tied-to-order equivalent? Join the sourcing ledger and we will prioritize demand by water, species, and pattern.

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 source
Regional 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 source
Signature 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 source
Broad 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
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Broad sourceStrong match

Fulling Mill Flies

Matched on nymph flies, trout, nymph. Large pattern house with broad freshwater and saltwater fly categories.

nymph fliestroutnymph
Visit source

John Barr created this nymph in Colorado, and it has been outfishing local knowledge ever since. The copper wire body flashes in the current like a tiny disco ball for trout. Tungsten bead gets it to the bottom where the trout actually live, as opposed to the surface where your ego wants to fish.

Quick Facts

TypeNymph
Difficultybeginner
SeasonsSpring, Summer, Fall, Winter
Target SpeciesRainbow Trout, Brown Trout, Mountain Whitefish
Sizes#12 - #20
Best LocationsSouth Platte River, CO; Frying Pan River, CO; Big Horn River, MT

Where to Fish It

South Platte River

CO · Tailwater

Frying Pan River

CO · Tailwater

Big Horn River

MT · Tailwater

Map unavailable. Locations for Copper John: South Platte River, CO; Frying Pan River, CO; Big Horn River, MT

Related Reading

region guide

Rocky Mountain Trout: A River-by-River Guide

The Rocky Mountain West holds the finest trout rivers in North America. From the gin-clear tailwaters of Colorado to the sweeping freestone rivers of Montana, these waters offer everything from technical dry fly fishing to aggressive streamer hunting. This is your river-by-river guide to all of it.

species science

How Trout See Your Fly: The Science of Color and Light

Trout don't see the world the way we do. They perceive ultraviolet light, detect motion through contrast rather than color, and see a dramatically different fly at ten feet of depth than at two. Once you understand their four-cone visual system, you'll never choose a fly the same way again.

hatch guide

Stoneflies: When Big Bugs Bring Big Fish

Stonefly hatches produce the most explosive dry-fly fishing of the season. From the legendary salmonfly emergence on western rivers to golden stones across the Pacific Northwest, these big bugs bring the biggest trout to the surface. Consider this your field guide to fishing Plecoptera — the clean-water giants that make twenty-inch trout eat flies the size of your thumb.

technique

Reading Water: Finding Fish by Reading Structure

Every river tells you where the fish are, if you know how to listen. Reading water is the fundamental skill that separates productive anglers from persistent ones. The ability to look at a stretch of river and identify the handful of spots that hold fish — and dismiss the vast majority that don't — is worth more than a lifetime of fly pattern knowledge.

technique

Fly Selection: A Decision Tree for Every Situation

Most anglers open their fly box and stare at it like a menu in a foreign language. But fly selection isn't mystical — it's a decision tree. Start with what the fish are eating, narrow by presentation depth, match the profile and size, and you'll arrive at the right fly in under sixty seconds. Here's the system.

technique

Barometric Pressure and Fishing: Fact vs. Fiction

Every angler has heard it: 'The barometer's falling — the fish are gonna feed.' But how much of barometric pressure lore is actual science, and how much is confirmation bias wrapped in a fishing vest? The answer is more nuanced than either camp wants to admit.

technique

Reading Stream Gauges: Flow Data for Better Fishing

Every major trout and steelhead river in America has a USGS gauge station publishing real-time flow and temperature data for free. Learning to read it is like having a scout on the river around the clock. Here's how to turn CFS numbers and trend lines into fish-catching intelligence.

technique

Nymph or Dry? The Decision That Changes Everything

Ninety percent of a trout's diet is consumed subsurface. Yet ninety percent of the magazine covers show a dry fly floating on calm water. The decision between nymphing and dry-fly fishing isn't about preference — it's about reading the situation and making the choice that puts your fly where the fish are actually feeding.

technique

Catch and Release: The Science of Fish Survival

We release fish and feel good about it. But does the fish survive? The science is both encouraging and sobering. Catch-and-release mortality varies from nearly zero to over forty percent depending on species, water temperature, fight duration, handling, and a handful of other factors entirely within the angler's control. Here's what the research says and how to maximize survival.

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Chosen with proof. Sourced with care.