Tailwater Fly Fishing: What Makes These Rivers Fish So Well and How to Approach Them
Some of the best trout fishing in the country happens directly below dams on rivers that would otherwise be too warm, too shallow, or too unpredictable to hold quality fish year-round. Tailwaters are unique fisheries shaped by the mechanics of how dams release water, and they reward anglers who understand what makes them different from freestone rivers. If you have a tailwater near you and have not fished it seriously, here is what you need to know.
Q&A: Tailwater Fishing Explained
What is a tailwater and what makes it different from a regular river?
A tailwater is the section of river immediately downstream of a dam. When a dam releases water from the bottom of the reservoir, that water comes from the coldest, deepest layer of the lake above. On rivers that would otherwise warm into the 70s and 80s during summer, dam releases keep water temperatures in the 50s and 60s year-round. That cold, stable water creates ideal trout habitat below the dam where none would otherwise exist, or dramatically extends the productive range of trout water that naturally exists further downstream. Tailwaters also tend to have more consistent flows and clearer water than freestone rivers, which creates both opportunities and challenges for fly fishers.
Why are tailwater trout often harder to catch than freestone trout?
Consistent conditions create educated fish. On a tailwater with stable temperatures, clear water, and predictable hatches, trout see a lot of anglers and a lot of flies. They develop selectivity that freestone fish, which deal with more variable conditions and less pressure, rarely match. A tailwater trout that has been presented with every popular midge pattern in sizes 18 through 22 learns to refuse the ones that do not look quite right. Fine tippet, precise presentation, and careful pattern selection matter far more on pressured tailwaters than on most freestone rivers.
What insects hatch on tailwaters and how does that affect fly selection?
Midges are the defining hatch on most tailwaters because they tolerate cold water better than other aquatic insects and hatch consistently year-round. Blue-winged olives are also common on tailwaters, particularly on overcast days in spring and fall. Some tailwaters support significant PMD and caddis hatches depending on the river and region. The combination of midges and BWOs means that small flies in the size 18 through 24 range dominate most tailwater fly boxes, with fine tippet and precise presentation required to fish them effectively. Nymphs in the same size range cover the subsurface feeding that accounts for most of a tailwater trout's diet.
How do dam releases affect the fishing and how do I plan around them?
Releases from hydroelectric dams respond to power demand and can change rapidly, raising water levels by a foot or more in minutes. Irrigation dams release water on agricultural schedules. Both can turn a perfect fishing day into dangerous wading conditions without warning. Before fishing a tailwater, check the release schedule from the dam operator or use a river gauge app to monitor real-time flow changes. Fish in the mornings on tailwaters managed for power generation, as demand is typically lower then. When flows increase, move to the banks and shallower edges where current is manageable, or leave the water entirely if the rise is significant.
Do I need different gear for tailwater fishing compared to freestone rivers?
The approach shifts more than the gear. A standard 9-foot, 4 or 5 weight rod handles tailwater fishing well. The leader system matters more than on freestone rivers: longer leaders of 12 to 15 feet create distance between the visible fly line and the fly, and finer tippet in the 5X to 7X range is often required for smaller patterns on pressured fish. Polarized sunglasses are especially valuable on clear tailwaters where sight fishing to visible trout is possible. Beyond that, the biggest adjustment is mental: slow down, observe more, and accept that precise presentation matters far more than covering lots of water quickly.
Tailwater Fly Picks
One of the most consistent tailwater producers in the shop. The slim profile, fast sink rate, and UV zebra segmentation give educated tailwater trout something realistic enough to eat. Fish it in sizes 18 through 22.
The dry fly that defines tailwater fishing on overcast days. When BWOs are on and trout are visibly rising in flat pools and tail-outs, this pattern on fine tippet with a dead drift is the right answer.
A flush-floating emerger pattern designed for the technical surface feeding that tailwater trout do during BWO and midge hatches. When fish are rising but refusing dun patterns, an emerger fished in the film is often the correction.
How to Approach Tailwater Fishing
Sight Fishing on Clear Water
The clear, consistent water of most tailwaters makes sight fishing possible in a way that freestone rivers rarely allow. Use polarized glasses and take the time to spot fish before casting to them. A trout you can see is a trout you can present to with intention, rather than casting hopefully through water and hoping for a take. Approach from downstream and below the fish's line of sight, keep a low profile, and make your first cast count. Tailwater trout that have been spooked by a bad presentation are often done feeding for the immediate future.
Fishing Midge Rigs
A two-fly midge nymph rig under a small, sensitive indicator is the workhorse setup for most tailwater days. Use a light indicator positioned at one and a half times the water depth, a long tippet section in 5X or 6X, and two midge patterns in sizes 18 through 22. The top fly can be a slightly larger or heavier pattern that helps carry the rig, with the smaller, more delicate pattern trailing six to eight inches below. Watch the indicator carefully. Takes on small midge nymphs in slow tailwater current are among the softest in trout fishing.
Managing Educated Fish
When fish are repeatedly refusing your fly on a tailwater, resist the instinct to change patterns immediately. First examine the drift. Is it truly drag-free through the feeding lane? Is the indicator disturbing the surface? Is the tippet landing in a pile that creates micro-drag you cannot see? Refusals on tailwaters are more often a presentation problem than a fly selection problem. After eliminating presentation issues, then adjust fly size smaller and tippet lighter before changing patterns entirely.
Fishing Below the Redd's Flies Home Water
The Chattahoochee River below Buford Dam in north Georgia is the tailwater closest to where Redd's Flies was built, and it is one of the most productive year-round trout fisheries in the Southeast. Cold water releases from Lake Lanier keep the Hooch in productive shape through even the hottest Atlanta summers. Midges and BWOs are the primary hatches, midge nymph rigs are the standard setup, and the educated brown and rainbow trout that live in that water have refined what the Redd's Flies fly selection looks like. The patterns that work on pressured tailwaters like the Chattahoochee work everywhere.
Tailwater fishing asks more of you than most river fishing and gives you more in return. The trout are bigger, more educated, and more rewarding to catch on their own terms. The hatches are reliable. The season never really ends. And the fly selection that tailwaters demand, precise, small, and well-presented, is the same selection that makes you a better angler on every other piece of water you fish.