When You Need to Get Down Fast
In nymph fishing, depth usually decides whether you catch fish. If your fly isn’t near the bottom, it’s not in the strike zone.
John Barr built the Copper John in the early 1990s to solve exactly that problem. He spent about three years on it before settling on the final design in 1996, wrapping a brass bead head with a fully wrapped copper wire body so the fly sinks fast without split shot weighing down your leader.
Why It Still Works
The copper wire body does more than add weight. The wrapped wire creates a segmented profile that reads as a general mayfly or stonefly nymph, without copying one bug too closely.
The flashback wing case is epoxy coated peacock herl, so it catches light in deeper, darker runs where flash actually helps fish find the fly. The copper wire also holds the fly together well over repeated use, since it’s wound tightly instead of relying on dubbing alone.
Choosing a Size
Size depends on water more than season.
| Size | Best For |
|---|---|
| #8 | Deep pools or fast current, as the point fly to get a rig down quickly |
| #10 | Spring runoff or stained water where a bigger profile helps |
| #12 | The standard size for most trout streams |
How to Fish It
Fish it alone, as the point fly in a tandem rig, or as the middle fly in a hopper-dropper setup. Most riffles and runs don’t need extra weight on the leader since the wire body and bead already get it down.
For a classic combo, run a smaller fly like a Zebra Midge or a Pheasant Tail Nymph 12 to 18 inches below it on 4X or 5X Fluorocarbon Tippet.
If you’re building a euro nymphing leader instead of fishing it under an indicator, a long Tapered Leader gives you a cleaner turnover for the tight-line presentation.
Common Questions
Do I need to add weight to my leader? Usually not. The bead and wire body are heavy enough on their own for most riffles and runs.
Is this an attractor or an imitation? Both. It reads as a general nymph shape, but the copper and flash give it more visibility than a plain natural pattern. It sits in the same general-purpose category as a Prince Nymph or a Gold Ribbed Hare’s Ear, three flies most anglers carry for exactly the same reason.
What other species take this fly? Trout are the main target, but it also works on panfish, and bigger or brighter colors can draw bass in weedy water.
What tippet should I use? 3X to 5X depending on size and water clarity. Heavier water and bigger fish call for the stronger end of that range.
New to nymphing and not sure what else to carry? The Euro Nymph Pro Kit bundles this fly with several other go-to nymphs so you’re not buying patterns one at a time.
Specs
| Size | Shank | Gape |
|---|---|---|
| #8 | 16.7mm | 5.4mm |
| #10 | 16.2mm | 4.5mm |
| #12 | 14.4mm | 4.2mm |
| Spec | Detail |
|---|---|
| Pattern | Copper John (John Barr, 1990s) |
| Hook | Heavy wire nymph hook, chemically sharpened |
| Head | Solid brass bead |
| Body | Copper wire, segmented wrap |
| Thorax | Peacock herl with epoxy flashback |
| Tail | Goose biots |
| Sizes | #8, #10, #12 |
| Target Species | Trout, Panfish, Bass |
The Copper John is already a proven fish catcher, but the “fast sink” version with the heavier wire body is a legit upgrade for deep runs. I fish big freestone rivers and I need my fly on the bottom fast. These get down there. The epoxy back catches light and I swear it triggers strikes on its own.