I think it’s fair to say that when most anglers think about trout, they picture smaller, wade-able, streams and rivers. These are, after all, where most people pursue these fish. But scattered throughout the country are big rivers that hold heavier wild brown trout than your average small flow. In many cases, these rivers are more known for their populations of walleye, smallmouth, and muskies. And while there may not be as many trout in these environments, the ones that do exist tend to grow big.
My good friend, Paul Cain, is a dyed-in-the-wool river rat from Western New York. Big-water trout fishing is his passion, and to get after it, he’s even modified a jet boat with oar locks, so it doubles as a drift boat. Though he’ll fish for them with a variety of gear and tactics, his preference is catching them on streamers. His insights into attacking big water with a fly rod can not only help you shorten the learning curve, but boost confidence if you’re ready to level up and hunt browns you measure in pounds instead of inches.
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Bank On It
Without question, the number one barrier to entry when it comes to small-stream fly anglers making the leap to a giant river is reading the water to find the fish. Yes, structure like boulders and deadfalls are all worth targeting, but there can also be very long stretches that appear rather featureless. That doesn’t mean, however, that they’re not holding massive browns. What you need to remember above all else is you can’t fish everything.
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“The number one rule for fishing big water, especially if it’s on the higher side, is we’re fishing to the bank,” says Cain. “That rule applies to pretty much any trout stream, of course, but if you’re trying to break down big water, you simply can’t cover it all, so it’s best to narrow it down to the few that have pushed close to the bank and are waiting to ambush a meal.”
Critical to keep in mind, however, is that fish “on the bank” doesn’t necessarily mean tight to the bank. There will be plenty of occasions when your fly gets attacked inches from dry land, but on a large river with heavy central flow, the area from the bank to approximately 30 feet off might provide softer ambush water that the fish will use. So, if you’re fishing from a boat, start at the bank but work your fly all the way back to the rod because boat-side hits are not uncommon.
Steady as She Flows
There is no better tool for increasing your odds of success on a large river than USGS water flow data. Most major rivers have gauging stations you can monitor online. What you’re looking for, however, is not necessarily a specific height or flow speed, but a steady, flat line on the graph.
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“One of the first things I learned about fishing big rivers is whether the flow is way up or way down doesn’t matter as much as you think,” says Cain. “What matters is consistency. The longer a big river maintains a steady flow with little to no fluctuation, the better the fishing will be.”
Too much fluctuation over short periods of time robs the trout of stable feeding zones. That’s not to say they won’t eat during rapid raising and lowering events, but the instability will force them to move around, reposition, and acclimatize to the current conditions before getting back in a steady feeding rhythm. So, in times of flux, you often have to cover more water than normal for a few bites versus stable conditions when hot zones will emerge, and you might pull half a dozen trout out of a 100-yard stretch of river.
Lure Them in with Flies
Streamer fishing a big river is more akin to fishing it with lures and spinning gear than it is traditional fly fishing. You’ll want to employ a 7- or 8-weight fly rod, a line with a sinking tip, and flies measuring 4 to 7 inches. One of Cain’s all-time favorites is the Circus Peanut, a meaty pattern with dumbbell eyes that provide some jigging action. Flies like this represent a big meal and “swim” similarly to a lure like a Rapala Floating Minnow. And according to Cain, if you rig them more similarly to a lure, you’ll have greater success.
“I use 15-pound mono as my leader, and that leader is rarely longer than a few feet,” he says. “A short leader turns the flies over easier and gives you more control. But I always cut the leader and re-splice it with a micro barrel swivel. Big flies will often twist your line during casting and the swivel helps stop that from happening.”
This little trick is also important because you want to get your streamer moving the second it touches down. Loops in your line, loose line around your hand, or twists in your leader can hamper that ability, but in a big water environment, hits can come at any time during the retrieve, including within a split second of touch down.
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