May 2026 South Holston River Fly Fishing Report & Watauga River Conditions

Early May Fishing Report: South Holston and Watauga River Conditions

Early May has brought some of the best spring conditions of the year to the South Holston and Watauga Rivers. Trees and wildflowers are in full bloom, and insect activity has continued to build across both systems. A few weeks ago, the annual black caddis hatch wrapped up on the Watauga, and since then we’ve seen the first strong push of sulphur mayflies. These sulphurs are just getting started and will remain a key hatch over the next several months.

Both rivers have been busy, with drift boats and wade anglers taking full advantage of this productive time of year. In this fishing report, we’ll break down what you may have missed in April, highlight the top producing flies for the South Holston and Watauga, and look ahead at what to expect as we move further into May.

April Fishing Recap: Caddis and Sulphur Hatch Activity

April brought a classic spring to both the South Holston and Watauga Rivers, with steady improvements in insect activity and overall fishing quality. The Watauga saw a strong black caddis hatch through the early part of the month, providing consistent opportunities for both dry fly fishing during peak emergence periods. As the caddis hatch began to taper off, sulphur mayflies started to appear on both rivers, marking the transition into one of the most productive dry fly periods of the year.

On the South Holston, nymphing remained the most reliable approach throughout the month. However, for the dry fly enthusiasts, there were some opportunities with BWO's during most afternoons. We noticed playing the subsurface game was the most effective way to find success.

Check out Watauga River Caddis Hatch Highlights Below!

Current River Conditions: South Holston and Watauga

The South Holston River is settling into a strong early May pattern, with more consistent fishing as water temperatures rise and insect activity continues to increase. Due to minimal rainfall this spring, the river has maintained lower-than-average flows from April into May. These low water conditions have created excellent opportunities for wade anglers, although float trips have continued to produce very successful days as well.

As of early May, we’ve noticed a steady increase in sulphur activity, especially after 1 PM during warmer afternoons. So far, the hatches have generally lasted around two to three hours, making timing especially important for anglers targeting dry fly action. Sulphur Puff Daddies and Comparaduns in size 16 have been some of the most productive patterns during these emergence periods.

Similarly, the Watauga River has remained on the lower side, although TVA has regularly been releasing water during the early morning hours between approximately 7 AM and 8 AM. This sudden rise in water can be dangerous for wade anglers, so it’s important to pay close attention to changing river conditions. The sulphur hatch has been consistent on the Watauga since mid-April. Earlier in the season, the best dry fly fishing was concentrated during the evenings, but we are now beginning to see steady insect activity throughout much of the day, with bugs appearing anywhere from late morning into the afternoon.

We are about to see a lot more Sulphur activity during the next two months.. Keep those Dry flies ready!

South Holston River Fly Fishing Conditions, Flows, and Hatches

The South Holston River is settling into a strong early May pattern, and with sulphurs now making their annual debut, there’s a lot to look forward to this month. While much of the attention during April was focused on the Watauga River caddis hatch, several of our guides spent time on the South Holston and were impressed with the quality of fishing.

Fishing pressure remained lower than normal throughout much of April, giving anglers more opportunities at larger fish that typically become more selective by mid-summer. This unique window of lighter pressure combined with excellent spring conditions led to a number of very successful trips on the river. Take a look at a few April trip highlights below.

During the month of April, we found the most success fishing BWO nymphs and scuds throughout the South Holston system. As we’ve transitioned into May, BWO nymphing has started to slow down slightly, while sulphur nymph patterns such as pheasant tails and split case nymphs have become increasingly productive.

Midges continue to produce year-round on the South Holston, so it’s no surprise they’ve remained effective for guests fishing with South Holston Angler. One interesting trend we’ve noticed recently, however, has been a significant increase in size 20 black caddis activity during the morning hours. Stomach samples have shown that some fish are heavily keying in on the pupae before the hatch begins. If you’ve found a productive pattern to imitate these small black caddis, let us know—we’re always interested in seeing what’s working for other anglers on the river.

Watauga River Fly Fishing Conditions, Flows, and Hatches

The Watauga River has transitioned nicely out of the caddis hatch and into early sulphur activity. Over the past month, sulphur activity on the Watauga has generally been stronger than what we’ve seen on the South Holston. Sulphur nymph patterns have produced the most consistent results, although overall nymph fishing has presented a few challenges in recent weeks. A combination of the short 7 AM–8 AM generation pulse and increased fishing pressure has caused fish to become more selective at times.

Avoiding the brief period of high water and focusing on dry-dropper setups with lighter tippet has produced the best results for us lately. There have definitely been periods where anglers have had to work harder for fish, but that’s part of fishing any technical tailwater system in the country—especially during periods of heavier pressure and changing conditions.

Soft hackle pheasant tails, standard pheasant tails, and small midge patterns have been some of the top producers recently. If you find yourself fishing during a sulphur hatch, try a size 16 Comparadun paired with a size 16 sulphur nymph dropper underneath. This combination can be especially effective during active emergence periods.

April Fly Fishing Trip Highlights on the South Holston and Watauga

April provided some incredible days on both the South Holston and Watauga Rivers. A few highlights from the month included a 29-inch South Holston brown trout, multiple 20-inch trout caught on caddis dry flies, aggressive smallmouth eating topwater flies, and technical nymph fishing for large brown trout in low, clear conditions. With sulphur activity continuing to build, we’re expecting to see more amazing days on the water throughout May.

Top Producing Flies and Techniques

Both the South Holston and Watauga Rivers have remained low and clear throughout the spring, creating more technical fishing conditions for anglers. To avoid spooking fish in shallow or slower water, our guides have primarily been using dry-dropper rigs or small yarn indicators instead of larger strike indicators. Traditional round bobber-style indicators tend to land harder on the water and can alert nearby fish to your presence in these clear conditions.

Longer leaders and lighter tippet have also been extremely important. In most situations, 5X and 6X tippet have produced the best results. When trout are actively feeding on size 20 midges and other small insects, heavier tippet becomes much easier for fish to detect—especially during periods of low, clear water.

If you’re looking for additional techniques, rigging setups, or seasonal fly recommendations, be sure to check out our Fly Fish Watauga and Fly Fish South Holston pages for more detailed river information.

Top Producing Flies for the South Holston River:

• #20 Olive Zebra Midge

• #16 Pheasant Tail

• #16 Soft Hackle Pheasant Tail

• #18-20 Scuds

• #16 Sulphur Comparadun

• #16 Sulphur Puff Daddy

Top Producing Flies for the Watauga River:

• #20 Zebra Midge (Purple, Black, Brown)

• #!6 Split Case Nymph

• #18 Frenchie Pheasant Tail

• #16 Sulphur Comparadun

• #16 Sulphur Puff Daddy.

May Fly Fishing Forecast for the South Holston and Watauga

Looking ahead, May is shaping up to be one of the best months of the spring season on both the South Holston and Watauga Rivers. Sulphur hatches will continue to build and become more consistent throughout the month, providing longer feeding windows and more predictable fish behavior as water temperatures stabilize. In addition to excellent trout fishing, May also marks the beginning of some exciting warmwater opportunities, including striped bass on streamers, topwater smallmouth action, and sight fishing for brown trout.

If we see a rainy May, anglers can expect some unique streamer fishing opportunities as rising water creates more aggressive fish behavior. If conditions remain low and clear, dry fly fishing and technical sight-fishing with nymphs should continue to improve across both rivers. No matter the conditions, May is one of the best times of year to be fly fishing in Eastern Tennessee.

To learn more about our guide trip program, be sure to check out our Guided Fly Fishing Trips page.

If you have any questions about booking a trip or current river conditions, feel free to Contact Us or call John Stunkard at 423-946-6665.

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