The Copper John: How to Tie the Nymph That Changed Modern Fly Fishing and Sinks Like It Means It

The Copper John changed what fly anglers expected from a nymph pattern. Before John Barr sat down at his vise in Boulder, Colorado in 1993, most nymphs were made of soft materials, dubbing, feather, fur, that absorbed water and sank slowly, if at all. The Copper John replaced all of that with metal. Wire body. Tungsten bead. Lead wraps under the thorax. Epoxy-coated wingcase. The result was a nymph that sinks like a split shot, stays in the strike zone through the entire drift, and flashes just enough to draw trout from several feet away.

Barr spent three years refining the pattern, testing hook styles, wire gauges, leg materials, and wing-case coatings, before declaring it finished around 1996. Within a decade, it was the best-selling nymph in fly shops worldwide. It still is. The Copper John lives in every fly shop in every trout town in America, and it catches fish everywhere trout eat subsurface, which is everywhere trout live, 80% of the time.

The fly doesn't imitate a specific insect. It suggests a dozen. The copper wire body catches light the way a mayfly nymph's exoskeleton does during emergence. The goose biot tails mimic the split tails of a stonefly nymph. The peacock herl thorax provides the dark, buggy silhouette that triggers feeding behavior in trout regardless of what's actually hatching. It's an attractor nymph, a pattern designed to look like food in general rather than any bug in particular, and its effectiveness across every trout fishery in the country proves that trout don't always need an exact imitation. Sometimes they just need something shiny that drifts at the right depth.

What It Imitates

The Copper John is technically a mayfly nymph imitation, the slim wire body and split biot tails echo the profile of a clinger-style mayfly nymph in the moments before emergence, when the nymph's exoskeleton begins to split and the insect becomes more reflective. But the pattern's versatility comes from its ambiguity:

• A mayfly nymph (the intended impression), sizes 14-18 in copper
• A small stonefly nymph, sizes 12-14 in black or brown wire
• A caddis pupa, sizes 14-16 in green or chartreuse
• A midge pupa, sizes 18-20 in red or copper
• A generic "something edible is down here", any size, any color

The flash of the wire body is the key. In moving water with broken light, the Copper John glints the way a real nymph does when its exoskeleton catches sunlight. Trout notice that flash, it stands out against the dark riverbed in a way that dubbed nymphs can't match. Combined with the bead head catching light from above, the fly creates a two-point flash signature (bead + body) that draws attention and triggers investigation eats.

The Recipe, Standard Copper John

How to Tie It, Step by Step

Step 1: Bead and weight. Slide the tungsten bead onto the hook (small hole first). Wrap 12-15 turns of lead wire around the shank behind the bead, then push the lead into the bead's recess to lock everything in place. Start your thread behind the lead wraps and build a smooth ramp from the bare shank up to the lead, this creates the taper that makes the wire body look right.

Step 2: Tails. At the hook bend, tie in two matched goose biots, one on each side of the shank, curving outward, tips extending about half a shank length past the bend. The biots should splay apart slightly, creating the split-tail silhouette of a mayfly nymph. This is the trickiest part of the fly, take your time getting the biots even and symmetrical.

Step 3: Wire body. Tie in the copper wire at the base of the tails. Wrap your thread forward to the 60% mark (where the thorax will begin), building a smooth, slightly tapered underbody as you go. This taper is important, the wire will conform to whatever shape is underneath, and a lumpy underbody makes a lumpy fly. Now wrap the copper wire forward in tight, touching turns over the thread underbody. Each wrap should sit flush against the previous one with no gaps and no overlaps. Tie off the wire and clip the excess.

Step 4: Wingcase. Tie in a strip of pearl Flashabou (one strand, folded) and a strip of black Thin Skin at the front of the abdomen, extending back over the wire body. These will be pulled forward over the thorax later.

Step 5: Thorax and legs. Tie in 5-6 peacock herls at the front of the abdomen. Twist them into a rope (or twist around the thread for durability) and wrap forward to just behind the bead, building a full, buggy thorax. Before wrapping all the way, tie in a small clump of hen-back fibers on each side of the thorax, these are the legs, and they should extend back to roughly the hook point. Finish wrapping the peacock herl to the bead.

Step 6: Wingcase finish. Pull the Thin Skin strip forward over the thorax and tie it down behind the bead. Pull the Flashabou strip over the top of the Thin Skin (right down the centerline) and tie it down. Trim both materials, build a small thread head, and whip finish.

Step 7: Epoxy coat. Apply a thin coat of 5-minute epoxy or UV resin over the entire wingcase (Thin Skin + Flashabou). This is what gives the Copper John its signature glossy, durable wingcase and, Barr believes, a subtle glow that mimics the translucence of an emerging nymph's shell. Let the epoxy cure with the hook inverted (bead down) so it doesn't pool.

The Variations, Color Changes Everything

John Barr originally tied the Copper John in copper only. Then fellow Colorado tier Michael White suggested trying red and green wire. Both caught fish immediately, and the color variation floodgates opened. Today the Copper John is tied in at least ten wire colors, and each has its place.

Copper (sizes 14-16), The original and still the most versatile. The warm metallic tone reads as a generic mayfly nymph in most light conditions. This is the default, the one you tie on when you're nymphing new water and need to find out what's down there. Your first choice on the Bighorn, San Juan, and Missouri.

Red (sizes 16-18), The midge and small mayfly color. Red Copper Johns are devastating during San Juan River midge hatches and anywhere red midges are part of the diet. Also works as a general attractor, the red flash stands out against dark substrates. Excellent on Pennsylvania limestone creeks during winter midge fishing.

Green (sizes 14-16), The caddis pupa imitation. Green wire matches the body color of many caddis species during emergence. Tie this one for the caddis-heavy rivers: Driftless Area spring creeks, Farmington River, and the Henry's Fork during summer caddis.

Chartreuse (sizes 14-16), Brighter and more visible than green. A great attractor in stained or off-color water where the copper version disappears. Works well as the point fly in a two-nymph rig, its visibility draws the trout's attention, and the trailing fly (often a Pheasant Tail or Zebra Midge) gets eaten.

Black (sizes 12-16), The stonefly nymph impression. Dark, heavy, and aggressive. Fish it in pocket water on the Lower Deschutes, the Madison, and the Smokies where stonefly nymphs are a major forage item.

Zebra / Silver (sizes 16-18), Black and silver wire creates a segmented, high-contrast body that reads as a midge pupa or BWO nymph. The flashiest variation, use it when you want maximum visibility in deeper or darker water.

Where to Fish It

The Copper John works in every trout stream in America, but here's where it's indispensable based on our destination guides:

• The San Juan River, New Mexico, The Copper John in red (#18) is a staple in the quality water. The San Juan's midge-heavy diet and clear water make the red version devastatingly effective as a trailing nymph behind a Zebra Midge.

• The Bighorn River, Montana, Copper in #14-16 nymphed through the runs and riffles. The Bighorn's consistent depth and moderate current are ideal Copper John water.

• The Missouri River, Montana, The Missouri's tailwater section demands nymphs that get down fast in 4-6 feet of water. The Copper John's weight makes it a natural point fly.

• The Green River, Utah, Section A's clear water and educated trout respond to copper and red Copper Johns drifted tight to the bank. The wire flash triggers reaction strikes.

• The Driftless Area, Wisconsin, Green Copper Johns during the caddis season. The small freestone creeks of the Driftless fish well with #16 Copper Johns as the heavy fly in a dry-dropper rig under a Chubby Chernobyl.

• The Lower Deschutes, Oregon, Black in #12-14 for the stonefly nymph season. The Deschutes' deep runs and heavy current demand a fly that sinks immediately and stays deep.

• The Battenkill, Vermont, Copper or red in #16-18 for the Battenkill's spooky wild browns. The flash is subtle enough to not spook fish but bright enough to draw attention.

• North Platte / Grey Reef, Wyoming, A two-nymph rig with a Copper John point fly and a Zebra Midge dropper is one of the most consistent setups on the Grey Reef tailwater.

How to Fish It, Getting Down Fast

The Copper John is a Euro-nymphing and indicator-nymphing fly, it's designed to sink fast, drift deep, and stay in the strike zone. Here's how to get the most out of it:

As a point fly in a two-nymph rig: The Copper John's weight makes it ideal as the heavy (bottom) fly, with a lighter nymph (Pheasant Tail, Hare's Ear, or Zebra Midge) trailing 18-24 inches behind on a tag. The Copper John gets the rig to the bottom; the trailing fly drifts at whatever depth the trout are feeding.

Under a dry fly (hopper-dropper): A #14-16 Copper John 2-3 feet below a Chubby Chernobyl or Stimulator creates a prospecting rig that covers both the surface and the bottom simultaneously. The Copper John's weight helps the dry fly track in a natural drift line.

Euro-nymphing: The Copper John was built for tight-line nymphing before tight-line nymphing had a name. The heavy bead and wire body get down immediately in a short-line presentation, and the flash of the wire body provides a visual cue even in broken water. Czech and French nymphers love this fly because its weight-to-size ratio is better than almost any other pattern.

Dead-drift only. Unlike the Woolly Bugger or Clouser Minnow, the Copper John is not a stripping fly. It fishes on a dead drift, the natural current carries it through the run, and the trout eat it as it passes their holding lie. Mend to keep the drift drag-free. Set the hook on any hesitation or twitch of the indicator.

How to Tie It, Video Tutorials

The Copper John is an intermediate-level fly, it teaches wire wrapping, biot tails, peacock herl thorax, and epoxy coating in a single pattern. Not the first fly for absolute beginners, but achievable after you've tied a few Zebra Midges and Pheasant Tails.

The standard: Charlie Craven's Barr's Copper John tutorial, Charlie ties the pattern as John Barr designed it, with clear explanations of proportions and the epoxy wingcase technique. Excellent production quality.

Step-by-step for learners: Tim Flagler's Copper John, Flagler's signature slow, detailed instruction with close-up camera work. If you've never tied goose biot tails before, start here.

Quick and efficient: Fly Fish Food's Copper John tutorial, A faster-paced tutorial that shows the pattern coming together efficiently. Good for tiers who want to batch-produce a dozen.

Tips From the Vise

The underbody taper is everything. The wire body conforms to whatever is underneath it. If your thread underbody is lumpy, the wire body will be lumpy. Take the time to build a smooth, gradual taper from the tail to the thorax, it's the difference between a fly that looks professional and one that looks like it was tied in the dark.

Goose biots have a right side and a wrong side. Each biot has a natural curve. When you tie them in as tails, the curve should splay outward, one curving left, one curving right, creating the V-shaped split tail. If both tails curve the same direction, pull one off and flip it.

Don't skip the epoxy. The wingcase coating isn't decorative, it's structural. Uncoated Thin Skin tears apart after a few fish. A thin coat of 5-minute epoxy or UV resin (Solarez or Clear Cure Goo) makes the wingcase nearly indestructible and adds the gloss that Barr designed into the pattern.

Match your bead to your water. Tungsten beads sink 1.7 times faster than brass. On deep, fast runs (Deschutes, Madison), tungsten is mandatory, brass won't get down in time. On shallow spring creeks (Livingston, PA limestoners), brass is plenty and reduces the chance of bouncing off the bottom.

Build Your Box

The Copper John box is simple, three colors, two sizes:

• Copper in #14 and #16 (6 each), the universal nymph
• Red in #16 and #18 (6 each), midge season and attracting
• Green in #14 and #16 (4 each), caddis water

Optional additions: Black in #12 (4, stonefly water) and Chartreuse in #14 (4, stained water).

That's 40 flies, a couple sessions at the vise. Use tungsten beads for everything; the weight difference over brass is worth the cost. Every one of these flies will catch trout on every river in our destination guides.