Classic Pro Tips: How to Tie and Fish Tandem Rigs

The classic “hopper-dropper” is but one option for fishing two flies in tandem.
Photo by Phil Monahan

Although multi-fly rigs have been around for centuries and have always remained popular in Europe, fishing more than one pattern was nearly a forgotten science in this country until about 25 years ago. In fact, even when angling magazines flooded the market with tandem-rig stories, many anglers outside the Rockies took a long time to catch on. For instance, my older brother, Brian, has been fly fishing since the late 1970s, but he had never fished two flies until we traveled to Wyoming a few summers ago. Troll a few Internet message boards, and you’ll find that a large portion of the fly-fishing community is still discovering the effectiveness of this “modern” technique.

But there’s a big difference between simply hanging a Copper John off the back of a grasshopper pattern (a rig commonly known as the “Hopper-Dropper”) and incorporating two-fly systems into your everyday angling arsenal. Many anglers think of the second fly as nothing more than an add-on, not as an integral part of their tactical approach, and they treat tandem rigging as a one-size-fits-all subject. Oftentimes, speakers or writers will refer to a “standard” tandem rig that features a nymph tied to a 12-inch (or 18-inch, or 24-inch, and so on) dropper. But such a “standard” fails to take into account water depth, current speed, weight of the nymph, and all the other myriad variables you’ll face on the stream. To exploit the full potential of two-fly rigs, you’ve got to put the same amount of thought into the components, construction, and performance of your rig as you put into matching the hatch.

The Clincher

The first hurdle an angler has to get over is fear of knots. I came late to two-fly rigs because I couldn’t see myself tying blood knots with extra-long tag ends, which were required for the old-style dropper systems I saw illustrated in my grandfather’s books. (To be fair, I look at those same diagrams now and wonder what intimidated me about them.) But the first time I saw someone clinch-knot the dropper to the bend of the top fly — it was a fellow guide on Depuy’s spring creek — I mentally slapped myself silly for not having discovered such a simple solution on my own.

There are still plenty of fly fishermen who tie blood-knot dropper rigs, and I know guys who swear that this method will always outfish an in-line, clinch-knotted system. I smile and nod when they explain their reasoning, but I’ve never seen any evidence to support the assertion. For instance, guides make their living by catching fish, and I’ve never seen a pro tie any kind of tandem rig other than in-line. Sure that’s an unscientific sampling, but it’s good enough for me. The in-line rig is easier to tie, easier to cast, and tangles less.

You can make the knot-tying processes easier in several ways. Some find that the loop at the bottom of the clinch knot tends to slide off the hook just as they try to thread the tag end through. By simply holding the top fly upside down (e.g., hook up), you can solve this problem.

If you’re familiar with the water you’ll be fishing — and therefore understand what kinds of tandem rigs you’ll need — you can tie the two flies together at home and carry the complete rigs rolled up in old film canisters (for a dry and a nymph) or leader envelopes (for two nymphs). Then all you’ve got to do is tie on the top fly, and you’re in business.

Matched Pairs

There is no limit to the number of useful two-fly combinations you can use: two drys, a dry and an emerger, a dry and a nymph, two nymphs, two streamers, a streamer and a nymph, and on and on. Although I’ve never tried it, I can even think of a couple of situations in which you’d want to fish a dry fly with a streamer as a dropper (or even vice versa). The topic of fly choice is too massive for a single article, so we won’t delve much into specific pairings; obviously, you want to use patterns that imitate the insects or baitfish that are available to trout.

But before you tie on any two flies, take a few moments to ask yourself a fundamental but too often overlooked question:What am I trying to do with this rig? As fly fishermen, we do a lot things out of habit or tradition. Other times, the course of action is so obvious that it requires little examination — when you can see trout slurping down duns, you tie on your closest imitation of what’s on the water. But when it’s not so clear what the trout are eating, most of us would be better off if we spent more time assessing the situation and thinking through our approach before we started casting. This is especially true when you’re using two flies, because the ways that the flies interact with each other becomes vitally important to the presentation.

One of my favorite setups during a blue-winged-olive hatch is a BWO Sparkle Dun
with a CDC Rabbit’s Foot Emerger as a dropper.

The large question above can be broken down into two parts: (1) How are the fish feeding? and (2) How can I construct a two-fly rig that will exploit this feeding behavior? The answer to question 1 is usually just a guess (hopefully an educated one), but you are in complete control of question 2.

For instance, if a hatch is in full swing but the fish aren’t taking the duns, you know that you should tie on a nymph as a dropper to imitate the emerging naturals. That’s just common sense. But how long should the dropper be? Before you attach that second fly, you need to determine the particular stage of the hatch and observe the behavior of the fish.

If there are just a few duns on the water and you don’t yet see feeding fish near the surface, a nymph on a 24-inch dropper will almost always catch more fish than a nymph on a 6-inch dropper because the trout are looking for nymphs lower in the water column. But, if trout are porpoising just below the surface, that shorter dropper line could be just the ticket because it puts the fly right where the fish expect to see it. Depending on how deep and fast the water is, you might need a 30-inch dropper to imitate the nymphs swimming up from the stream bed in the moments just before the duns start popping up on the surface. Clearly, an angler who indiscriminately chooses a 12- or 18-inch dropper every time out is not giving himself the best chances to score.

You must also think about how the flies will behave in the water. When you’ve got two nymphs on, for instance, the drift of each will be affected by the other, and you can use this to your advantage. If you see trout in fast, clear water feeding on small mayfly nymphs near the bottom, you’ve got a difficult presentation problem. You need to get a small Pheasant Tail down fast, yet make it look as if it’s drifting free.

Tie on a bead-head nymph as the top fly, and then determine the length of the dropper tippet by asking how far off the bottom you’d like the second, lighter fly to be. The heavy bead-head will drag the lighter fly down in the water column, but a long dropper will allow the Pheasant Tail to drift above the stream bed and be buffeted by small changes in the current, just like the real thing. A shorter dropper will keep the second fly closer to the bottom.

An unweighted Pheasant Tail and a heavy stonefly nymph can be a deadly combination.

A good friend and serious angler likes to use the combination of a bead-head stonefly imitation and a buoyant mayfly pattern. He reasons that “swimmer” nymphs, such as blue-winged olives and Isonychia, that get knocked into the drift will wriggle their way back to the bottom as fast as they can and trout must be conditioned to eat these nymphs before they can reach safety. The bead-head fly gets the rig down to the bottom, and the buoyant fly drifts above it. By twitching the rod tip, my friend makes the second fly dive toward the bottom like a panicked natural. This is a great setup to use in a slow pool below a riffle.

This is the perfect example of an angler who has carefully considered how best to make his two-fly rig imitate a specific behavior that will elicit strikes. For many of us, what makes fly fishing so much more interesting than other forms of angling is that it requires us to think through the various processes — rigging, casting, drifting, and the like — required to catch fish. Building and using tandem rigs should be based on that same process of inquiry and problem solving.

If you’ve never tried fishing a tandem rig, give it a shot; there’s nothing very complicated about the setup, and it will increase your chances of hooking up. If you already fish two flies, you can make the game more interesting and productive by tailoring each tandem rig to the specific conditions you find on the water. Do away with the notion of a “standard” rig, and use your ability to read water and your knowledge of trout behavior to fashion a two-fly system that will give you the best chance to hook up.

15 thoughts on “Classic Pro Tips: How to Tie and Fish Tandem Rigs”

  1. I am currently using 2 flies tied on similar to tournament fishing the heavier fly on the bottom. Also the bottom fly is tied on a jig style hook which helps prevent some snagging. We hi tie the flies to the line or dropper, I use a non-slip knot to allow the fly additional movement.

    Biggest fish so far is 16+ rainbow.

    Also, I simply change spools to change over t dries.

  2. Great article. When I took a fly fishing class on Michigan’s AuSable river a number of years ago, the instructor taught us this method. At high noon on a hot July day, I immediately hooked into a good fish (and immediately lost it). The lesson was learned! I’ll be trying this tomorrow on the Manistee.

  3. Excellent article. The dropper loop knot is the ticket for me, I’ve always had trouble tying a dropper on. Understanding what’s going on before just tying on a standard rig is an important tip.

  4. “guides make their living by catching fish, and I’ve never seen a pro tie any kind of tandem rig other than in-line.”

    This isn’t true. I’ve seen plenty of guides, mostly Czech technique guys, who tie on flies off the tag end of a triple surgeons knot off the tippet. It’s easy to cast and doesn’t tangle. you should try it.

  5. I use two flies all the time in the heat of summer. Hopper droppers, Chubby droppers, whatever you want will work. The nymph usually wins out and is taken most of the time (especially when the sun is out). On streams with large stonefly populations, big rubber legged junk works really well. Try it. You will be impressed.

  6. Great article- good thoughts but reconsider your position on using the triple surgeons knot tag end for your dry fly with a hopper dropper set up. Your dry fly will behave more naturally on the surface rather than being dragged down by the nymph. Also if you activate the hopper or swing it you’ll achieve more enticing action with the dry- not encumbered with the dragging nymph.

    1. I’ve read a couple comments similar to yours and am trying to understand. Do you mean leave a long enough tag end (off your first fly) that extends out to tie your dropper on? Thank you! Ellie

  7. I pre tie them and use old wine corks to store them. Poke one flys hook into the edge of the cork and then wrap the Tippett around the cork. Just stick the other fly in and you’re good to go!

      1. I pre-tie dropper rigs and wrap them around a sponge or piece of foam..multiple rigs and then put it in a zip-lock bag.

  8. for tying the dropper, im a big fan of the Davy Knot. tie on the lead fly, then tie a davy knot separate from the rig but dont cinch it all the way down. I usually pull a length off the spool but dont cut it off yet, this makes managing the whole thing easier while holding a rod and flies. slip the loop of the Davy over the hook bend and tighten. Super fast and easy. if you fish when its cold you can rig this when your fingers are numb

Leave a Reply

Your email address will not be published. Required fields are marked *