In this report
Flow is Down—Fish the Micro-Zones
We’re running 104 CFS at Deckers, and that’s a hard left turn from the ideal. The reference sweet spot here sits 150–400 CFS; anything below 150 means thin water, high visibility, and spooky trout. At 104, you’re dealing with a river that’s showing its bones—every riffle is shallow and bright, the deep slots are narrower than usual, and fish that would normally spread across a run are now bunched in whatever pocket will hold them without exposing their position to the sky.
This is honest fishing. It rewards precision and punishes sloppy technique. The upside: you will know exactly where the trout are, because there are fewer places for them to hide. The downside is they’ll know you’re there just as quickly if you wade heavy or throw a shadow.
October Midges Dominate; BWOs in the Mix
Midges are the all-year spine of this tailwater, and they own October on the Deckers reach. You’ll see small black midges working the softer margins and the inside bends, especially in the mornings and again from late afternoon into dusk. Fish a Mercury Midge or Black Beauty in #22–24 emerger, or go naked with a Zebra Midge #20 if the water’s flat enough to sight the drift. The emerger is better insurance here; these fish are keyed to the vulnerable stage, and at low flows, a good emerger presentation will often outpull a dry.
Gray-sky days—and early October can bring them—flip the script slightly. Blue-Winged Olives in #20–22 will show up on overcast stretches, particularly over the glide water and the slower inside edges where silt and debris collect. Don’t treat BWOs as the main event this time of year; they’re supplementary. A single #22 BWO emerger or parachute wing dry is a solid backup pattern to have, but lead with midges.
Brown trout are entering pre-spawn mode. If you’re targeting bigger fish and conditions allow, a #6–8 olive or brown streamer—think Woolly Bugger or a simple articulated Shank pattern—fished slow and tight to deeper pockets will draw strikes from males holding low. This is situational and seasonal, not a primary strategy, but don’t ignore it on your last drift through a deep slot.
Rigging for Low, Clear Water
At 104 CFS, your rig philosophy shifts. The water is too thin and too exposed for heavy nymphing with big split-shot. Instead, go light and precise.
Primary rig: A #22–24 midge emerger (Mercury, Zebra, or RS2) on 5X or 6X tippet, 18–20 inches below a small dry-fly anchor in the #16–18 range—a Parachute Adams or a #18 Griffith’s Gnat works fine. This is a sight-and-dead-drift setup. You’re watching the dry, reading the rise form (or lack thereof), and landing the emerger 2–4 feet deep in the narrow current lanes where trout are holding. No split-shot needed; the emerger sinks on its own in this low-velocity flow.
If you need depth in the deeper slots: Add one small split-shot 12 inches above the emerger, not a string of them. Tight-line nymphing is your friend here—no indicator, just feel and visual tracking of your line as it enters the drift. The single midge emerger fished on a short 3–4 foot leader will reach the bottom of even the narrow deeper runs without dragging or spooking fish in gin-clear water.
Tippet choice: 5X for the point fly on a dry-dropper; 6X if you’re confident in your knot work and the fish aren’t large. At 104 CFS, the trout here are smart, not big. Thin tippet reduces refusal and micro-drag. Keep your drifts short and your presentation drag-free—this water doesn’t reward lazy casting.
Where to Focus Your Time
Skip the wide, shallow flats. They’ll look empty, and they will be. Target the inside bends where the current slows and deepens, even just 2–3 feet of measurable depth. Trout compress into these micro-zones at low flows, and a single well-placed cast into a 6-foot pocket will produce more than twenty false casts across an open bar.
Deep slots and darker water between riffles are prime. These are your high-percentage zones. Wade slowly and quietly into position below them (casting upstream), and work the tail and middle of the depression first. If nothing rises on the first three drifts, move on; at this flow, fish are reactive and immediate.
Riffle tails and the soft drop-offs where water transitions from fast to slow hold consistent midge activity. The boundary is where midges emerge and where trout feed with the least effort. A #22 emerger cast just above the drop-off and allowed to tumble down the slope will draw strikes.
Avoid the wide, bright runs mid-reach. They’re harder to fish than they look, and the payoff rarely justifies the approach.
Water Temp and Fish Stress
October water at Deckers cools steadily as the month progresses, and that’s working in your favor right now. Early fall means water temps are likely in the upper 40s to low 50s—cold enough to keep trout active and metabolically willing to feed, warm enough that they’re not torpid. Respect this by handling fish quickly if you keep any, and by releasing any you don’t intend to take. At 104 CFS and dropping, the margin for thermal stress is smaller than usual.
Access and Stewardship Note
Deckers Bridge, Trumbull, and Scraggy View will be quieter now than in peak summer, which is a gift—fewer crowds, easier parking, less pressure on the fish. The roadside access is straightforward, but CO-67 can become problematic later in the season. Plan your trip accordingly, and always verify current regulations before you fish; the 2-trout daily bag and flies-and-lures-only rule are the current standard, but rules change year to year.
Low flow like this is also a reminder to stay on established trails and wade-paths. Trout are concentrated and visible; help keep this fishery healthy by respecting the water and the banks.