The fish is rising every four seconds. You have the right fly, in the right size, on 7X. You put it in the lane. It drifts over the fish. Nothing. You do it again. Again. Again.
That’s the Trico hatch, and by that point the fly has stopped being the variable. What’s left is the drift, and on flat tailwater the drift is a genuinely harder skill than anything else this river asks of you. This page is about that drift — the leader, the cast, and how to get a #22–24 fly to arrive looking like it isn’t attached to anything.
Where to stand, when it happens and which fly to tie on are the other three decisions, each on its own page.
What is micro-drag, and why can’t you see it?
Micro-drag is drag you cannot see at thirty feet. In a riffle it’s forgiving: the surface is broken, the currents are chaotic, the fish has half a second to decide, and a fly moving slightly wrong gets eaten anyway.
Now put that fish in six inches of glassy water with a hundred real insects in its lane and three hours of practice at telling them apart. Your fly is moving a hair faster than the naturals around it, or tracking a fraction off their line, and that is the only difference between it and the real thing. The trout notices. It has nothing else to do.
That’s what makes it maddening — the drift looks fine to you. It looks fine to you right up until the fourth refusal, at which point most anglers change flies, which is the fly-fishing equivalent of restarting the router.
Everything below exists to buy you a few more feet of a fly that is genuinely going the same speed as the water.
The leader: length, and how it lands
Total length: 12 feet minimum. 14 on the meadow flats. Build it off a standard 9-foot 5X tapered leader, add about 18 inches of 6X, then your 7X tippet on the end — that stacks up to 12 to 13 feet without a hard jump in diameter. The length isn’t superstition — it buys separation between the fly line and the fly, and on water this clear the fly line landing anywhere near a feeding fish ends that fish’s participation in your morning.
7X fluorocarbon, and it is not optional. That’s 0.004 inches. Six-X will catch fish on this water, and the refusal rate climbs enough that you’ll feel it inside an hour. When you start breaking off — and you will — the temptation to buy some insurance at 6X is strong and it is a trap. The fish are not forgiving about tippet diameter on a glassy flat in full spinner fall. Take the losses.
Tippet section: 24 to 30 inches of 7X. Longer than about 30 inches and you lose turnover; the leader stops straightening and starts landing in a heap wherever the wind decides. Shorter and you lose the soft-landing behavior that’s the entire point.
The part most people skip — what the leader does when it lands. A leader that turns over hard and lands straight is a leader with no slack in it, and a fly with no slack in front of it starts dragging the moment it touches down. What you want is s-curves in the last 18 inches of tippet. Those curves are your drag-free window. The current has to consume them before it can telegraph anything to the fly, and that consumption is measured in feet of clean drift.
You get them by not powering the cast. Stop the rod a little high, let the loop’s energy dissipate before the leader has fully straightened, and the tippet section collapses into a soft accordion. It looks like a slightly sloppy cast. It is a slightly sloppy cast, on purpose, and it’s the highest-leverage habit here.
Fluoro or nylon — the honest version. I fish fluorocarbon out of habit and for the lower visibility. The tradeoff is real and worth knowing: fluoro is denser than nylon and wants to sink, which is the last thing you want under a fly that’s supposed to sit flush in the film. Plenty of good anglers run nylon on small dries for exactly that reason and they aren’t wrong. Either works if the drift is right, which tells you something about the relative importance of these two decisions.
Position before you cast
Where you stand relative to the fish decides which of these techniques you even get to use, and you get one chance to choose because you can’t reposition mid-fall without consequences.
Get above the fish and off to the side. Upstream and at an angle — not directly above it, which puts your leader down the middle of its lane, and not directly beside it, which puts you in its window. Somewhere around 30 to 45 degrees upstream of the fish is the working angle.
Then get closer than feels right. Every foot of line on the water is a foot the current can grab. A clean drift at 25 feet beats a hopeful one at 45, and on a flat you can usually close that distance if you do it slowly and stay low. Most people cast far because moving feels risky. Casting far is riskier.
Stay low and stay still. In low morning light on flat water, you are the tallest object for a hundred yards and you are backlit. Kneeling looks ridiculous and works.
The downstream presentation
This is the core move on flat tailwater risers and it runs against every instinct trained into you by upstream nymphing.
Cast down and across, and the fly gets there first. That’s the whole argument. An upstream presentation puts the leader — and often the line — over the fish before the fly gets there, and on this water that’s a fish you’ve now educated rather than caught. Downstream, the fish sees the fly first and the tippet trailing behind it, which is the order the real insects come in.
The cost is the hook set, which gets harder because you’re pulling the fly back toward yourself and away from the fish’s mouth. It’s a real cost and it’s still the right trade. More on the set below.
The reach cast
The workhorse. As the loop unrolls on the downstream cast and before anything lands, tip the rod upstream and lay the running line up-current of the fly. You’ve now bought several feet of drift before the current catches the line and starts pulling.
Done in the air, every time. This is not an on-water mend performed quickly.
The pile cast
For when you need slack more than you need accuracy. Aim high, stop the rod hard, and let the leader collapse into a heap on the water. The current eats the pile before it can telegraph anything to the fly, and you get a foot or two of dead drift out of it.
It is not an elegant cast and it catches fish that elegant casts don’t.
The stack mend
For a long, defined feeding lane — the sort of thing the Dream Stream flat specializes in. After the cast lands, feed small strips of line with low rod-tip strokes, piling slack up-current of the fly. Done properly you can extend a drift four to six feet without the fly moving an inch.
The failure mode is doing it too fast and twitching the fly, which on this hatch is a fish gone rather than a fish curious.
On-water mends: last resort
Every flip of line on the water risks moving the fly, and moving the fly is the one thing you cannot afford. Front-load all your slack before anything lands. If you genuinely need an on-water mend, do it well upstream of the fly, low, and slow.
The pickup
The end of the drift matters as much as the start. Let the drift finish past the fish, then lift cleanly and early — before drag sets in, not after. Dragging a fly back through a pool of feeding trout to save a bad cast is how a flat with eight risers becomes a flat with two.
If the cast was wrong, it was wrong. Lift, move, cast again.
My take
I spend more time thinking about how my tippet lands than about which fly is tied on, and for this hatch that’s about right. The pattern is almost always fine if I’m in the right size range — what costs me fish is the thing I can’t see, a fly tracking a fraction off thirty feet away in flat light. Longer leader, softer delivery, downstream angle whenever I can get it, and the discipline to lift a drift that’s gone wrong instead of hoping it fixes itself. There’s a version of me who fishes this hatch beautifully and never sets too hard. I’ve met him about four times.
The set, the fight, and the losses
The set is a wrist rotation. That’s all. Lifting hard on a #22–24 hook and 7X does one of two things: breaks you off on the strike, or straightens the hook. Neither involves a fish in the net. A quick rotation of the wrist is enough to turn that hook, and on a downstream presentation you’re already pulling in a favorable direction.
Don’t set on the rise ring — set on the eat. A Trico take is a sip, not a swirl, and the reflex strike is the most common way to blow a fish on this hatch. Wait until you see the mouth close or the ring form on your fly. It feels like an eternity and it’s about a quarter of a second.
Fight the fish with the rod high and the butt section doing the work. Never crank down on 7X with a stiff forearm. Set the drag lighter than feels comfortable — on a 4- or 5-weight, back it almost off entirely and use palm pressure when you actually need it. A 12- to 18-inch trout is well within 7X’s roughly two-pound breaking strength if you let the rod absorb the surges instead of your arm.
Play the fish on the reel. Strip-fighting on 7X is how you find out exactly where your weakest knot is, at the least convenient moment available.
Wind knots halve your tippet without telling you. Inspect the 7X by feel between fish, cut and retie the moment you find one, and never fish through it. Check the knot at the fly after every trout as well — and if your terminal knots are the weak point, the three knots I actually use is where I’d start.
And expect to break off. Carry spare spools of 7X and spare flies in the sizes you actually fish. Losses are the cost of doing business at this scale.
What flows do to your margin
Deckers and Cheesman typically run somewhere in the 100–250 CFS range through summer, though reservoir management moves that around.
Below about 150 CFS the water gets shallower and clearer. Risers are easier to spot and fish concentrate onto the obvious soft water, which sounds like good news and is half of it — the other half is that the fish can see everything, including you, and your margin for a sloppy delivery goes to roughly zero. Low water is when the leader length and the s-curves stop being refinements and start deciding your morning.
Higher flows push more water through and can cover the flats that produced at lower levels, which changes where you stand more than how you cast.
Check the Deckers gauge (06701900) before you drive — it’s the USGS real-time gauge for the Deckers reach, while the water below Cheesman is reported through Colorado DWR — and check CPW for current conditions and regulation updates. The Deckers access guide covers where those flows actually fish. Access boundaries and special restrictions vary by section and do change from year to year. Don’t assume last season’s rules.
Presentation quick reference
| Variable | What I run |
|---|---|
| Leader length | 12 ft minimum, 14 ft on meadow flats |
| Butt/taper | 9 ft 5X leader + ~18 in of 6X, then 7X |
| Tippet | 7X fluorocarbon, 24–30 inch section |
| Target landing | S-curves in the last 18 inches; fly ahead of tippet |
| Angle | 30–45° upstream of the fish, off to the side |
| Distance | As close as you can get without being seen |
| Primary cast | Reach cast, aerial mend |
| Slack tools | Pile cast, stack mend; on-water mends last |
| Hook set | Wrist rotation only, on the eat not the ring |
| Drag setting | Nearly off; palm pressure as needed |
Frequently Asked Questions
Q: Do I really need 7X for Trico fishing? On flat, clear South Platte water in a full spinner fall, yes. Six-X will catch fish and it will also draw refusals from trout that are inspecting hundreds of naturals in the same lane. The right response to breaking off is better technique — light drag, high rod, wrist-only sets — not heavier tippet.
Q: How do you avoid drag when fishing tiny dries on flat water? Fish a 12- to 14-foot leader with a 24–30 inch 7X tippet section, present from upstream and across so the fly arrives ahead of the tippet, and build your slack into the air with a reach cast or pile cast rather than mending on the water. Aim for s-curves in the last 18 inches of tippet — those curves are the drift.
Q: Why do I keep breaking off on the hook set? Because you’re lifting rather than rotating. A #22–24 hook needs almost nothing to turn, and 7X has roughly two pounds of breaking strength. Rotate the wrist and stop. Also check for wind knots — one knot halves the tippet’s strength and gives no warning before it lets go.
Q: Should I fish upstream or downstream to Trico risers? Downstream, or down-and-across. On flat water an upstream presentation drags the leader and often the fly line over the fish before the fly arrives, which puts the fish down. The downstream angle costs you some hook-setting leverage and it’s still the correct trade on this water.
Q: What rod and drag setting for 7X? A 4- or 5-weight with a soft enough tip to protect fine tippet. Back the drag almost completely off and use palm pressure when a fish makes a run — a stiff drag setting plus a sudden surge is the most reliable way to lose a good trout on 7X. Whichever reel you fish, how its drag behaves at the low end is what matters here — click-pawl versus disc drag is the longer version of that argument.
Get the s-curve and the reach cast dialed and you’ll spend a lot less of the morning changing flies and a lot more of it watching trout actually eat — which is the whole reason you got up before dawn.
Next: where the fish will be, and when the fall lands.