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Finding Feeding Trout

You can have the best gear and be a great caster, but it won’t mean a thing if you don’t know where to find feeding fish. We’ve covered a lot of these things separately in other articles, but here is a quick breakdown of the four things you really want to look for before you make that first cast.

Water temperature

A wild trout’s water temperature range for feeding is typically between 50 – 67 degrees. Ideal temperature is upper 50’s to low 60’s. There are plenty of exceptions that you can read about in Understanding Water Temperature, but this is a pretty good rule of thumb and should be your first consideration when trying to locate feeding trout.

Check that water temperature

If you’re not already familiar with a particular stream’s seasonal variations and trends, a stream thermometer will be your most useful tool. Submerge it for a minute in water that’s about 1-2 feet deep. If, for instance, it’s July and you get a reading of 68-degrees, you should, at the very least, seek out shadier parts of the stream. Ideally, you should try to get to a higher elevation where it’s a little cooler. If it’s March and you get a reading of 47-degrees, seek out sunnier places and, if possible, move to a lower elevation.

Part of this may require a little research on your part as well. If you’re fishing in a low elevation stream where the water temperature stays above 70-degrees for much of the year, there likely won’t be trout in there at all, even during colder months. Again, this is for wild trout. Some streams that might be too warm to support wild trout year round, could be stocked with trout during the colder months.

Depth

Once you have located an area with a suitable water temperature, you need to look for deeper water. We’re not talking about water that has to be over your head, but something at least a foot or two deep. In times when food is incredibly abundant like a heavy hatch, trout will sometimes feed in shallower water. But in general, they will choose water with a little more depth for more protection from predators.

Current

Even if you have ideal water temperature and adequate depth, trout don’t do a lot of feeding in still pools. And even when they do, they can be very difficult to locate and catch because they’re often cruising and feeding sporadically. A defined current is essentially a conveyor belt of food. Most feeding trout will be near currents, watching and waiting for food to come to them.

Abrams Creek Smoky Mountains
Currents can vary significantly in a single run

In currents with a slow to medium speed, trout will likely hold right in the middle of the current and on the edges. Hard currents with a lot of speed are a little different.  A trout won’t hold in the middle of a hard current because it requires too much energy. Instead, the trout will be on the edges of these currents or between currents in seams and pockets.

Structure

A trout often has a few places in an area where he likes to hang out. He may have a favorite spot to feed and a spot under a rock where he likes to hide when he senses danger. Sometimes, you’ll find a place that looks perfect as far as depth and current speed go, but the stream bottom may be nothing but flat bedrock. These areas usually don’t hold many fish because there are few, if any, safe places. Try to look for a bottom with a lot of rocks where fish can hide.

Significant structure like fallen trees or large boulders often attracts the bigger fish, particularly if that spot meets all of the other criteria mentioned above. If you find any of the characteristics mentioned above, you’re apt to find a few feeding trout. When you locate a spot with ALL of these characteristics, you’ll likely find the most and/or the biggest trout.

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Winter Fishing in the Mountains

Little River in the Snow
Little River in the snow

We’ve talked a lot about water temperature in many of these articles and for good reason. Things like approach, presentation, and fly selection can determine whether or not a fish will take your offering. Water temperature can determine whether or not a fish will take any offering! You can read in more detail about water temperature in A Matter of Degrees. To keep it simple here, wild trout in the Smokies just don’t do a lot of feeding when the water temperature is in the 30’s and low 40’s.

Tailwaters are different because the water comes from the deep, insulated layer of a lake. The water temperature remains relatively constant, regardless of air temperature. Stocked trout in a freestone stream are different because, well, they just don’t know any better. They were raised in hatcheries and were fed the same amount of food every day, regardless of temperature. But wild trout in freestone streams have never had that luxury. In order to survive, their metabolism changes and they become nearly dormant. This doesn’t mean that they won’t feed at all but if you’re going to fish the Smokies in the winter, come prepared with a great deal of patience.

I spend more time looking this time of year than I do actually fishing. Blind fishing a run in the spring can be very productive because all or most of the fish should be feeding. They’ll often move up and down and side to side for food. In the winter they typically won’t move much for food and you need to put the fly right on their nose. To do this most effectively, you really need to see the fish. Take your time and watch the water. Pay particular attention to the slower currents on the edges and lower parts of a run. Ideally, you want to locate fish that are up in the water column rather than hugging the bottom. Fish that are up a little in the column are more likely to be feeding.

If you can’t actually see the fish, look for flashes on the bottom. Any fish that is feeding will likely be picking nymphs off the bottom. When a trout eats a nymph off the bottom, they usually tilt their bodies sideways. When they do, you’ll see the flash of their lighter colored bellies. You may have to scope out several pools or runs before you see fish or fish activity. Experience will teach you the kind of water to focus on. But deeper, slower runs will usually produce better than fast riffles and pocket water this time of year. And try to pick the warmest part of the day, probably late morning to late afternoon.

Little River Brown Trout Smoky Mountains
Cold weather brown

Once you think you’ve located feeding fish, it’s time to think about fly selection. On warmer winter days, you may actually see some insects hatching. If you do, they’re likely to be small and dark: Blue Wing Olive mayflies, small black stoneflies or caddis, dark olive or black midges… Rarely anything bigger than a #18. On rare occasions, you may see fish feeding on the surface during one of these hatches. Small Parachute Adams or Griffith’s Gnats are a pretty good bet in those instances. Mostly though, they’re going to feed more on the nymphs, so black Zebra Midges, small Pheasant Tails, and small black or olive Hare’s Ears will be pretty good bets.

If I don’t see any kind of hatch, I may still try one of the above mentioned nymphs, but more likely I’m going with something big, like a stonefly nymph. It may be more psychological, but I feel like I’m more likely get that lethargic fish to eat if I show him a bigger mouthful. Girdle Bugs, black Wooly Buggers, Yuk Bugs, and Bitch Creek Nymphs in sizes #10 – # 4 are personal favorites.

Girdle Bug Fly Pattern
Girdle Bugs

Regardless of your nymph selection, you’re going to want it to drift as slowly and as near the bottom as possible. I like to use heavy flies and I like to use split shot. Take your time and adjust your weight regularly as you move to areas with different depths and current speeds. If you’re not hanging up on the bottom from time to time, you’re not deep enough. If you’re hanging the bottom every time, you’re too deep. Take the time to get it right. That fly needs to be right in their nose!

Adjusting your strike indicator (if you’re using one) can help too, but usually the answer is more weight. Most fishermen just don’t have their nymphs deep enough in the winter. A great way to learn about the effects of different current speeds vs. the amount of weight on your line is to spend some time fishing a fly you can see under water.  For instance, tie on a bright pink egg and watch how deep it sinks, how fast it sinks, and how it drifts with no weight, then 1 spit shot, then 2 split shot, etc. Try it with a strike indicator and without to learn how the indicator can impact the drift, too. This is just a great way in general to better understand nymphing, and sometimes you’ll even catch a fish on that trashy pink egg!

Again, don’t expect near the number of strikes that you might in spring. But if you’re just itching to get out of the house and are willing to be patient, you might just be surprised what you find.

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Early Spring Fishing – Locating Feeding Trout

Early Spring on Abrams Creek
A Smoky Mountain River in early spring

If you’ve ever fished with me or have read more than two articles in this newsletter, you undoubtedly know how much I emphasize the importance of water temperature when fishing for wild trout. Often in the summer, it can be too warm in many places, causing trout to be lethargic or even migrate to cooler water. In winter, it can be too cold, causing changes in metabolism and a shut down in feeding. In early spring, you’re often fishing right on the edge of good water temperatures. Throughout the day, you may encounter totally different feeding behaviors – from hour to hour and from pool to pool.

Though it’s not quite this exact, 50-degrees is kind of the magic number we’re looking for. When we see water temperatures at or above 50-degrees for the better part of the day, we typically start to see actively feeding fish. This is due to not only the change in metabolism, but also the increase in bug activity. It can be deceiving, though, when we start to have these warmer days but the overnight temperatures are still getting pretty cold. It may be late morning or early afternoon before the water has had time to warm to a “stimulating” temperature.

So forget what your granddad told you about getting to the water at dawn. That’s great advice during the heat of summer. In early spring, it will usually only give you a lot of casting practice. There are always variables based mostly on weather. But your best fishing this time of year will probably be between 11:00 a.m. and 5:00 p.m. Sleep in, eat a late breakfast, get to the water around 10. You’ll have time to gear up, and enjoy your afternoon.

This is also not the best time of year for making that 7-mile hike to a high elevation brook trout stream. With very rare exceptions, your water temperatures are going to be considerably cooler at high elevations. This is the time to focus on lower and mid elevation streams.

Little River in Spring
The heads of large pools can be great locations for feeding trout

Now that you’re at the right place at the right time, there are other things you want to look for. While slower pools often fish poorly later in the year, they can be great places to fish in early spring, mostly because of the abundance of food. The best hatches, at least in the Smokies, occur in the spring and you can target a lot of feeding fish in these pools. Dry fly fishing can be at its best on early spring afternoons and it’s a great opportunity to find a larger brown trout feeding on the surface. Even if there is not an active hatch, there are plenty of bugs preparing to hatch. Drifting nymphs along the bottom, particularly near the heads of these pools can be very productive.

The other advantage to larger pools this time of year is they typically have less tree canopy. The water gets more direct sunlight. Seeking direct sunlight is counterintuitive to many fishermen. But in the early season, it often means warmer water. And even if the sunlight isn’t significantly warming the water, it is likely stimulating more bug activity. This will in turn, stimulate fish. Still, bright sunlight can have a negative impact on fish and their willingness to feed. I try to seek out and pay particular attention to the “sweet spots.” Sweet spots are good holding water that has a nice mix of sun and shadows.

Finally, when choosing days to fish this time of year, really try to pay attention to the overnight lows more than the daytime highs. Warmer overnights will better maintain those water temperatures we’re looking for. And don’t be afraid to get wet. A warm rain can raise water temperatures and turn fish on quicker than anything this time of year!

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A Matter of Degrees – Water Temperature

Understanding Water Temperature

Checking Water Temperature
Checking water temperture

One of the most significant factors that determines how, when, or even IF a trout feeds, is water temperature – at least with wild trout. Stocked trout are raised in hatcheries and fed every day, so they are used to eating every day. Water temperature can impact the way they feed but not nearly to the extent it does a wild trout.

Cold Weather Fishing
A cold weather stocker

An ideal water temperature for a trout is in the upper 50’s to low 60’s. If you show up at the river, dunk your thermometer in the water, and get a reading of 60-degrees, chances are you’re going to have a pretty good day – assuming you do everything else right. On the other hand, if you do everything exactly right but the water temperature is 38-degrees, you may not even get a strike.

On a broader scale, I think of anything between 50 and 68-degrees to be reasonable. But there are variables. 52-degrees and falling due to a cold front may result in tough fishing. 48-degrees and rising due to a warm front may produce excellent fishing. Fish will probably be sluggish if it’s 68-degrees and rising in a summer drought. But 68-degrees and falling because of a summer rain may really turn them on.

With warmer temperatures, it’s more about the oxygen than anything. Trout need oxygenated water and typically, the warmer the water, the less oxygen. If water temperatures hit 75-degrees for more than a few days in a row, trout can’t survive. They’ll either search out more suitable conditions or die.

Stream Thermometers
A stream thermometer can be a valuable tool when searching for active trout

With excessively cold water, it’s more about metabolism. As a survival mechanism, their metabolism changes when water temperatures get extremely cold and they don’t require as much food. It’s similar to a bear during hibernation. So if you’ve ever tried to get me to take you fishing in the Smokies in January and I talked you out of it, that’s why. I have great gear and am not afraid of getting out in the cold, but the fish just wouldn’t be feeding.

On some extremely fertile rivers, this may not be the case. There may be enough food through the winter to keep the fish feeding. I know I’ve fished some excellent winter hatches in Montana. But the streams of the Smokies are the opposite of fertile. They’re some of the oldest mountains in the world and consequently very acidic and nutrient poor, which means there is just not a lot of food, especially in the winter.

There are a number of things that can influence water temperature, with air temperature being one of the most obvious. In the mountains, air temperature and consequently, water temperature can vary significantly by elevation. For instance, a river at 2000’ elevation may see an air temperature of 85-degrees in July with a water temperature of 68-degrees. But if you go to a stream at 3800’ elevation on that same July day, you may find an air temperature of 75-degrees and a water temperature of 61-degrees. That’s why I typically like to focus on high elevation streams in the middle of the summer.

Of course, the opposite is true early in the season. The high elevation streams may be too cold while the low elevation streams are starting to turn on. I once guided a local gentleman on a high elevation stream in July and we had a very productive day. He called me, frustrated, the following March. He said he’d just been to the same stream I took him to, did everything the same way, but didn’t even get a strike. In July, the water temperature had been 60-degrees on that stream. When he went back in early March, it had been closer to 40-degrees. It matters.

Tree canopy can also have a big impact on water temperature. A bigger, more open river may not be very productive on a late June afternoon. But a smaller, more heavily canopied stream at the exact same elevation might be very productive. It seems pretty obvious when you think about it, but the more direct sunlight that reaches a stream, the warmer the water is going to get.

Time of day is another big factor. A lot of people think you have to be on the water at the crack of dawn to catch fish. This is only sometimes true when you’re talking about stream trout. In the heat of the summer, very early and very late in the day are probably the times when you’ll find the most active fish, because you’re getting slightly cooler water temperatures. However, if you’re fishing in early March or late November, you’ll likely find more active fish in the middle of the day, when water temperatures are slightly warmer. That’s one of the reasons why our peak fishing seasons are in months like May or October. The temperatures are mild pretty much all day, and the fish are active pretty much all day.

This is all very specific to free flowing streams. Tailwaters are totally different animals all together. When a river is dammed to form a lake, they release water from the dam every day to control flooding and to generate electricity. The river that is formed below the dam from these releases is referred to as a tailwater.

Norris Dam
Many rivers below large dams maintain nearly constant water temperature all year

The water that they pull from the lake to form the tailwater comes from near the bottom of the lake. Because that water is so deep, it receives no sunlight and is basically insulated by all the water above it. So, the water that comes out of the dam is approximately 50-degrees, regardless of time of day, time of year, or air temperature. That’s why that big, wide-open river can support trout. Spring Creeks are very similar because the water source is deep underground, insulated by earth.

How deep the lake is determines how much cold water “storage” it has. That and the volume and frequency of water releases determine how far down river the water stays cold. Your typical East Tennessee tailwater will maintain these temperatures, and support trout, for about 25 miles. So when it comes to tailwaters, you’re always going to have about the same water temperature, making them year round fisheries. With tailwaters, it’s mostly the timing and duration of the water releases that determine when, or even if you can go and how much success you’ll have.

Back to the mountains, water temperature is one of the things that I pay the most attention to when deciding when and where to fish. I’ve been doing this a long time so I just kind of know based on all of the conditions. Until you “just know,” a stream thermometer can be one the most valuable pieces of gear in your bag.