Understanding Stream Gauges

Little River Tennessee water level

Guides and fly shops routinely spit out numbers from stream gauges, often expecting you to react with pure delight or sheer terror when you hear them. The fact is, unless you spend a lot of time on the water as an angler, paddler or other related water bum, those numbers won’t make a lot of sense to you. Most folks would probably just like to know whether or not they can go fishing. But the better you understand these numbers, the better decision you’ll be able to make on if to go, where to go and what to expect when you get there.

Stream Gauge Basics

There are a lot of things about reading these gauges that are extremely simple while other aspects can get a bit complex. Many things regarding how water flow is going to impact a stream, you just have to see for yourself to truly understand. Then you can relate that to a gauge number and get a pretty good idea of what that water will look like before you leave the house.

Before these gauge readings were posted on the internet, you had to just make your best guess and/or drive to the river to see if it was going to be too high to fish. Even now, with these numbers so easily accessible, there will sometimes be some guesswork, but at least it’s a much more educated guess!

Accessing Stream Gauge Info

Water Flow Data for smartphone
River Data App

The USGS has stations all over the country and there are a number of different search features to locate the gauge on or nearest the fishery in which you’re interested. Many larger rivers will have multiple stations spread out on different parts of the river. You can, of course, use a search engine to locate a specific place. Or go to usgs.gov and begin your search there. There are also a number of apps that can be downloaded. They make searching for a particular location much simpler and keep that information right in your pocket. I use an app called RiverData that gives you access to any river gauge in the country.

Stream Gauge Locations

It’s important to note that not every stream has a gauge. So, you sometimes have to rely on the closest gauge to your fishery and assume that both water systems received similar weather. For example, if I’m going to fish Deep Creek in the Smokies, the nearest gauge is on the Oconaluftee. Most of the time, Deep Creek is going to get the same or similar rain events as the Oconaluftee… but not always.

And even when you have a gauge on the stream you’re specifically interested in, isolated weather systems will sometimes skew the data. For instance, Little River has a gauge located in Townsend, below the confluence of the three prongs. So, if the water rises on any of those prongs, it will ultimately impact the numbers on the gauge downstream in Townsend. Usually if the gauge numbers are reading high in Townsend, the water will be up on all three prongs as they are close enough together that they typically receive similar weather. However, there have been occasions when there was an isolated heavy rain on East Prong that only raised water levels on that branch. Of course, the downstream gauge in Townsend reflected that spike but the West Prong didn’t come up at all.

Unless you’re closely tracking every weather system, there’s just no way to account for something like that. Stream gauges are wonderful tools for determining water levels before you make the trip to the river. But without multiple stream gauges spread out on different sections of every stream in a watershed, you will often, to some extent, be making decisions based on probability rather than 100% certainty.

Understanding Stream Gauge Tools

stream gauge options smoky mountains

Not every gauge provides the same information. Some will provide a cubic feet per second (cfs) reading, some will provide a height reading (usually measured in feet), some will include a temperature reading and many have all three. A handful will get even more in the weeds and provide things like dissolved oxygen readings. For real water flow nerds, most will also allow you view charts in weekly, monthly and annual views. As long as a gauge has been in a location for forty years, I can probably look up what the flow was in that location forty years ago!

It’s also worth mentioning that different gauges may update at different intervals. Most will update at least once an hour while some may provide updates every 15 minutes. But none (that I know of) are providing data feedback in real time. Just above the selected chart will usually indicate the last time the data was updated.

CFS Reading
Smoky Mountains water flow
Stream gauge in CFS

This reading tells you what the flow of the stream is. If the reading is 125cfs, it means that the flow is 125 cubic feet per second. A lot of anglers that really know a stream rely heavily on this number. However, the more casual angler may be easily deceived by this number as the “ideal flow” can vary significantly from stream to stream. The broader and sometimes flatter a streambed is, the more water flow it can comfortably accommodate.

So, 800cfs on a steep, narrow mountain stream may be a total blowout and not fishable at all. On a wider, flatter, low elevation mountain stream, 800cfs might be perfect. On a flat, 75-yard wide tailwater like the Clinch, 800cfs might be considered as a low flow. On a side note, I use generation schedules and data provided by TVA for local tailwater information.

Gauge Height Feet
Little River stream gauge
Stream Gauge in Feet

This reading tells you how high the water is on the gauge and gives you, I think, a little more “universal” reading. At least when it comes to mountain streams, about 2’ on that gauge is nearly always going to be close to “normal flow,” regardless of how wide or steep the stream is. For instance, the Oconaluftee is at a normal, near perfect level when it is at 2’ but may be flowing at around 550cfs. Little River is also normal and near perfect at 2’ but may be flowing at around 200cfs.

Again, there are a lot of variables like stream size and gradient but typically, in most Smoky Mountain streams, 2.5’ is the high side of good. In other words it is still wadeable in most of the usual spots but more difficult. When you reach 3’ on the gauge, you might still find some wadeable spots in isolated areas of small streams but pickings will be really slim. If you don’t know the water really well, don’t mess around with this. Beyond 3’, you’re likely just looking at a blown out river!

Water Temperature
Stream Gauge Water Temperature

You won’t find this feature on every gauge, but some will have it. It’s a nice feature but you have to keep in mind that it’s reading temperature where the gauge is and water temperature will change significantly as you gain elevation on a stream. For example, the Little River gauge is located in Townsend at about 1100’ in elevation. If you’re going to fish Little River around Elkmont Campground, your elevation will be around 2300’. That coupled with more stream canopy, means your water temperature at Elkmont should be considerably cooler than the gauge reading at Townsend.

It’s not an exact science but as a general rule, you drop about 4-degrees water temperature for every 1000’ you gain in elevation. So, if the stream gauge for Little River reads 62-degrees, the water temperature at Elmont should be closer to 58-degrees. This can make an enormous difference when you’re trying to find feeding trout.

Improved Clinch Knot

The Improved Clinch Knot, like its predecessor we showed you last month, is used to attach the fly to the tippet. The video will explain the differences in the two knots, why and when you might want one over the other and, of course, how to tie it.

The Wonderful World of Worms

The thought of fishing with a worm pattern makes many fly fishing purists cringe. I have to admit, I sometimes feel a little dirty about it but I’m not sure why. I think it’s kind of like the disdain some fly fishers have for strike indicators, probably due to their similarity to bobbers. Bobbers and worms are the tools of bait fishermen and fly fishers don’t like the thought of doing ANYTHING akin to bait fishing!

The thing is, fish eat worms – even the sophisticated trout. When we choose most fly patterns, we are doing so because they resemble something we think the fish is eating. Therefore, why should fly patterns that imitate worms be any different? Maybe it’s just because the patterns for worms just don’t have the same elegance and beauty as say, a traditional wet fly pattern.

Maybe it would help to verbally justify it when you tie on a worm pattern. That’s what I do. In much the same way I acknowledge eating that piece of pie as a bad decision right before I eat the piece of pie, I always declare that I’m going to fish junk before I put on a worm. There’s just something about that self-awareness that allows us to forgive ourselves and sleep at night. And when it comes to fishing the worm, it doesn’t hurt that they flat out catch fish!

San Juan Worm

Just like any fly pattern, a worm imitation isn’t magic. You’re not going to instantly catch a bunch of fish because you’re using a worm. You still have to do all of the other things right like approach and presentation. And sometimes, even when everything is done correctly, the fish may just not be feeding and/or they may not be feeding on worms.

Fish that live in streams with rock bottoms and banks are simply not going to see as many worms as fish in streams with silt bottoms because it’s not their habitat. In the mountains, I have the best success with worms after a good rain. But that’s probably true about anywhere. We’ve all seen an abundance of worms on our sidewalk or driveway after a good rain because they are flooded out of their “holes.” The same thing happens on a stream bank and many of those worms end up in the stream where fish are looking for them.

Under normal conditions, I don’t have as much success with worm patterns, at least with wild trout, or even holdover stocked trout. But freshly stocked trout will often eat a worm pattern with reckless abandon simply because it’s colorful. Fresh stockers tend to be suckers for anything bright or shiny. However, with wild trout, even when they don’t eat the worm, I think it gets their attention.

I will routinely fish a pink or red worm as the top fly of a double nymph rig and for the bottom fly, I’ll use a more subtle, maybe smaller pattern like a Pheasant Tail. Over the years, it’s happened way too many times to be coincidence.  I’ll fish a fly like a Pheasant Tail by itself or in tandem with another nymph with no success. When I re-rig and use that same Pheasant Tail below a worm, it suddenly begins catching fish! I don’t think that’s necessarily unique to worm patterns, though. I’ve had similar results using various bigger, brighter flies above smaller, subtler ones.

Squirmy Worm

There are a lot of different worm patterns out there, but there’s only so much artistic interpretation a fly tyer can have when it comes to worms! The San Juan Worm has long been the gold standard, but more recently, the Squirmy Worm has won favor with many anglers. They are essentially the same pattern but with different body materials. The traditional San Juan Worm has a body made of vernille or micro-chenille, which has less movement but is more durable. The Squirmy Worm uses a stretchy, silicone material, which offers a lot of movement but can come apart after several fish. Pick your poison.

In any case, there are a number of different colors available. Pink and red are the two best colors for me. However, colors like purple, orange and brown have all had their moments.

Green Weenie

And it has certainly been well documented that a Green Weenie is a killer fly in the Smokies. While it fits a little more loosely in the worm category, it still very much fits. Most commonly thought of as an inchworm imitation, it has a smaller, more robust profile than most worms and is most productive in a chartreuse color.

Fightmaster Fly Fishing Survey

I am exploring a few options with a couple of different facets of my business. If you have just a second, I would appreciate your input by completing this very quick survey. Thanks for your help!

Thank you for your interest! Unfortunately, this survey has expired.

February Fishing Forecast

Winter Fishing Tellico
Winter Fishing

Smoky Mountains

January has been relatively mild for the most part but very wet. So water levels have been up more than they’ve been down. And even in a mild January we’re talking about water temperatures in the 40’s at best, so not exactly stellar fishing. But a few fish have been caught and the mountains look completely different in the winter, so it’s always nice to get out.

February will likely be more of the same. You never know what you’re going to get around here but February usually stays pretty cold and things don’t consistently start warming up until about mid March. I know I sound like a broken record but I do find myself having to explain this to wannabe winter fishermen more than anything else… It’s not that I’m worried about being uncomfortable in the cold. I have great gear and don’t mind the cold one bit. It’s all about the water temperature with wild fish and if that water temperature is significantly below 50-degrees, they just don’t do much feeding.

And in the winter, it takes a lot to reach those temperatures. Even when you get a couple of nice 60-degree days, the overnight lows are still often in the 30’s and your water temperature just won’t climb much. When the days get longer and the overnight lows get warmer, you’ll start to see better water temperatures and active fish!

If you do get out this month, expect to be nymphing. Go with darker patterns and try to fish them right on the bottom, focusing on pools and slower runs. Here’s a little bit on winter fishing in the mountains.

Delayed Harvest

February is the last month for Delayed Harvest streams. These stocked fish should be quite a bit more active than their wild brothers in the Smokies. However, by February, poaching has usually taken its toll and there just aren’t a lot of fish left. Nymphing will definitely be the ticket on these streams. Standard nymph patterns are worth a try and anything bright and shiny is a good bet!

Clinch River

As usual, the fishery that does have good water temperatures year round and should fish well in the winter is cranking 2+ generators 24 hours a day. Last year was a tough one on the Clinch. A very wet spring resulted in very few days of low water. Unfortunately, this year is starting out the same way. Man, every year seems to be flood or drought. Is an “average” year too much to ask for?

December Fishing Forecast

delayed harvest rainbow tennessee
Delayed Harvest Rainbow

December is kind of the beginning of “fishing for the sake of going fishing” season. That’s not to say that fish can’t be caught, but we begin to see a lot more bad days than good ones, at least as far as activity goes. Spending the day on a quiet, snowy stream catching nothing is still a pretty good way to spend a day!

Mountains:

Right now we’re seeing water temps in the mid 40’s in low elevation mountain streams. As a broad rule, trout don’t feed very actively much below 50. You can still catch them but don’t expect a 40 fish day. You’ll need to nymph slow and deep and focus on the slower pools. Sleep in, eat a good breakfast and head to the stream a little later in the day. Your best fishing will be through the middle part of the day when water temps are at their warmest.

As suggested above, nymphs will be the ticket most of the time in December and throughout the winter. Darker patterns like Pheasant Tails, olive or black Hares Ears, and Prince Nymphs are good bets. Bigger stoneflies like Girdle Bug might produce but don’t disregard the small, dark Zebra Midges. I would use a tandem rig pairing a large stone with a smaller nymph.

On warmer, sunnier days, you may see isolated surface activity. If so, they’re likely eating BWO’s, black caddis, or small black stoneflies. So, you may want to keep a few of those in your box. Actually, some small Parachute Adams and Griffith’s Gnats should take care of most of your small fly needs.

Delayed Harvest:

The DH waters should be a little more productive through the colder months. Stocked trout just aren’t as impacted by the cold water temperatures. Unfortunately, the later into DH season we get, the fewer fish you will find. Poaching is always a problem on these streams. Any of the nymphs mentioned above should do okay along with any shiny or colorful nymphs you may have.

Clinch River:

This report always sounds like a broken record, but the Clinch should fish well anytime during the winter as long as you get favorable water releases. We’ve seen some good release schedules sporadically throughout the late fall. But at the time of this writing, they are running 2+ generators around the clock. You just have to keep checking. Oh yeah… midges.

Gold Ribbed Hares Ear

Gold Ribbed Hares Ear
Gold Ribbed Hares Ear

The Gold Ribbed Hare’s Ear, commonly just referred to as a Hare’s Ear, is one of the oldest nymph patterns known. However, the history on the fly is shaky at best. If I’m being honest, the history of this fly is so vague and cumbersome that I just got tired of looking! But there are numerous references in many of the old English fishing journals to a similar fly that, at the time, was more of a wet fly. The more current nymph version of the fly appears to have been around since at least the 1880’s. There are two unrelated tyers, James Ogden and Frederick Halford, who both frequently receive credit for its origin.

When I write my comprehensive history on American trout flies, I’ll dig a little deeper. But for purposes of this newsletter article, let’s just say that it has been catching trout for a LONG time!

The Gold Ribbed Hare’s Ear gets its name from the materials that are used to tie it. It seems they weren’t quite as creative with fly names back in the day. Should we call it the Sex Dungeon?!?! No. It’s tied with materials from a hare’s mask and a piece of gold tinsel for a rib. Let’s call it a Gold Ribbed Hare’s Ear.

What the fly lacks in name creativity, it more than makes up for in productivity. It is easily one of the most popular and effective nymph patterns of all time. Most agree that it is intended to imitate a mayfly nymph, but it is also an excellent representation of a caddis nymph and many crustaceans. And while the original natural rabbit color is still quite productive, there are countless color variations. Personally, in addition to the natural color, I love a black Hare’s Ear in the winter and an olive in the early spring to imitate Quill Gordon nymphs.

in addition to color variations, there are countless other variations. Many will have some kind of sparkle rib or sparkly back. Some might have a wingcase made of peacock herl. Of course, there are beadhead versions and micro jig versions. Like many great flies, its versatility is a big part of its effectiveness.

If you’ve been trout fishing for a while, you undoubtedly already know this fly. If you’re new to trout fishing, you need to know it. Since this is originally appearing in a winter newsletter, included one of my favorite winter variations of a Hare’s Ear below.

black beadhead flashback hares ear
Beadhead Flashback Hares Ear – Black

Hook: #18 – 12 2x long nymph hook
Thread: 8/0 Black
Bead: Gold tungsten to match hook size
Rib: Gold wire
Tail: Guard hairs from hares mask. Dyed black.
Wing Case: Pearlescent Flashabou
Abdomen: Black hares ear dubbing
Thorax: Black hares ear dubbing (picked out)

West Prong Little River

west prong little river
West Prong Little River

Location: GSMNP East Tennessee                          

Nearest Town: Townsend, TN

Species: Rainbow trout                                            

Average Size: 6”

Stream Size: Moderate                                           

Pressure: Moderate

Type of Water: Freestone, Mountain                      

Boat Access: None

Best Times: Spring and fall                                      

Favorite Flies: Attractor dries

Nearest Fly Shop:    Little River Outfitters – Townsend

Camping:      

Little River Campground
Cades Cove Campground
Backcountry Campsite #17

Directions: 

From Townsend, travel southeast on 73 to GSMNP entrance.  At the “Y” in the road, turn right on Laurel Creek Road (toward Cades Cove).  You will immediately pick up the stream on the right and find a few pull-offs where you can access the stream.  At approximately two miles, the road ceases to follow the stream.  There is a parking area at this point where you can access the backcountry portion of West Prong, but there is no trail so you will have to return through the stream. 

A trail does intersect the stream approximately two miles up from the road.  This is the West Prong Trail and can be accessed directly across the road from the Tremont Institute.  Again, the trail does not follow the stream at any point but will grant you access to the upper reaches of West Prong at their intersection at Backcountry Campsite #17.  To reach the trailhead, travel southeast from Townsend on 73 and turn right at the “Y” on Laurel Creek Road.  Take your first left toward the Tremont Institute.  The Tremont Institute is approximately two miles back on your left, and the trailhead is at the parking area on the right, across the road from Tremont. 

                                  

                                

                       

                     

May Fishing Forecast

Clinch River Rainbow
Big ‘Ol Sulphur Eating Rainbow on the Clinch

Smoky Mountains

May is traditionally a great month to fish in the Smokies and this year should be no different. With the mild temperatures seen in May, you have pretty much every option on the table, from low elevation roadside rivers to high elevation backcountry streams.

Hatches are usually at their best this time of year, too. During the day, you should see mayflies like March Browns and Light Cahills, a number of different caddis species, and the most prolific hatch in the Smokies, the Little Yellow Sally shtonefly. Toward the end of the month, you should also see some of the larger golden stones hatching. They are often seen in sizes #8-#6 but mostly hatch at night. However, trout are often still looking for them after sunrise, so a big dry fly like a Madame X can be a good bet in the mornings.

Speaking of nighttime hatches. The month of May often showcases some of the most consistent hatches of the year right before dark. From about 7pm until dark, look for hatches of sulphur mayflies coinciding with egg-laying Little Yellow Sallies.

Clinch River

As usual, the Clinch River is anyone’s guess as far as water releases. We had some very favorable generation schedules through much of April and the fish was great. In recent days, they’ve been pushing quite a bit more water, leaving a much smaller window for the wade fisherman.

Typically, May is the month when the sulphur hatch really gets underway on the Clinch. We’ve seen a few popping off in recent weeks. When this hatch is in full swing, it’s really something to see. Hopefully the water releases will cooperate!

Otherwise, it’s the usual suspects on the Clinch. Beadhead Pheasant Tails and a variety of colors of Zebra Midges should do the trick.

Hendrickson Hatch

Hendrickson Dun
Adult Hendrickson Mayfly

Hendricksons have long been a favorite springtime hatch for Eastern fly fishermen. In the Smokies, they typically follow the Quill Gordon and Blue Quill hatches by two or three weeks. Most years, that means we don’t see Hendricksons until mid to late April. Because a warm stretch of weather in February triggered an early Quill Gordon hatch, things are a little out of whack and we are beginning to see Hendricksons now. I expect them to be around until about mid April.

Like many hatches in the Smokies, Hendricksons rarely come off in enormous, widespread numbers. But in the right place at the right time, you can find enough of these bugs to inspire some steady rises from trout. And while generic, attractor fly patterns will get you through most situations, having a fly that more closely matches what the fish are seeing never hurts!

Hendricksons hatch sporadically throughout the day in the Smokies but tend to be most active in sunny areas during the warmest part of the day. Most days this time of year, that means in the 2pm – 5pm range. They inhabit all types of water but I tend to see emergence occurring most in slow to medium currents.

Hendrickson Nymph
Hendrickson Nymph

The nymphs are not particularly good swimmers and they have an unusually robust profile. This combination of traits makes them very popular with the trout. Their color varies from reddish tan to dark, reddish brown. Tan and olive Hare’s Ear Nymphs work well for imitations. Whitlock’s Red Fox Squirrel Nymph is another great pattern during this hatch. Pheasant Tail Nymphs provide a nice color match but are pretty slender compared to the beefy naturals. In any case, they range in hook size from #14-12.

The adults also vary a bit in color. Much of that depends on the gender of the bug. The males tend to be darker, varying from grayish olive to grayish brown. However, the females are often a little lighter, sometimes taking on a tan or even pinkish hue.

Parachute Hendrickson
Parachute Hendrickson

While there are certainly numerous fly patterns specifically designed to imitate all of the variations of a Hendrickson, you can do pretty well with generic patterns as well. A Parachute Hare’s Ear works well, particularly when you’re seeing more of the lighter colored adults. And there’s always the Parachute Adams, especially when you’re seeing the darker variations. Like the nymphs, you’ll best match the naturals in sizes #14 – 12.

Early Wet Fly
Early Season Wet Fly

Finally, trout love taking the emerging insects during this hatch, so a wet fly can be an excellent choice. One of my favorites is the Early Season Wet Fly. I often fish it in tandem with another fly. Try it as the top fly of a nymphing rig with a Hare’s Ear or Red Fox Squirrel nymph down below. Or tie it as a dropper off the back of your dry fly of choice.