In this report
390 CFS and Cooling Water — A Sweet Spot Before the Winter Slide
The Arkansas below Pueblo Reservoir is running 390 CFS this week, and for early October, this is genuinely solid water. The gauge has room to swing — swings here are dramatic and quick — but right now you’re looking at a flow that wades cleanly, spreads fish across the channel instead of bunching them into two or three holding slots, and keeps the water temperature at 59°F. That’s cool enough that trout are active and holding in their natural positions rather than retreated to deep refuge. Before the dam’s release schedule tightens for winter (when flows will drop and stabilize around 70–150 CFS) or spiked by autumn precipitation, this is the window. Check the live flow chart before you drive down — this tailwater doesn’t hold a number — but if it’s holding in the 350–500 range, you’re in business.
Fall BWO and Midges: The Primary Pattern Right Now
October’s hatch clock on this water runs tight and small. The fall baetis (Blue-Winged Olive) emerge on gray days and in low light, running #20–22, and they’re active here now. More important: midges are perpetually present on the Pueblo tailwater — they’re the backbone of every season — and right now the October cold snap pushes more midge activity into the middle of the day. Black Beauty (#20–24), Mercury Midges (#22–24), and zebra midges (especially in emerger form, #22–24) are what you need to tie on.
The fly choice tells you something real about this water’s character. This is not a river where you win with big attractors and thrashing around. The tailwater below the dam holds intelligent, selective trout that have seen ten thousand flies. They feed on small stuff consistently — emergers and nymphs in the film and in the column, not on the surface — and they’re spooked by thick tippet and clumsy presentation. That’s the game here, and October is when it’s most obvious, because the water is clear and the light is sharp.
The Actual Rig: Deep Nymphs with Midge Emergers
Set yourself up this way: tie a small, slim anchor fly — a #22 zebra midge or RS2 emerger in black — as your point fly. Six inches above it, add a #20–22 baetis nymph or small Flashback Baetis emerger as your dropper. Rig your tippet in 6X or 7X; the water is clear and the flies are small, and trout here respond hard to tippet that blends. If you’re going subsurface (which you will be most of the time), weight the rig with a single small split shot placed about 18 inches above the point fly — this keeps the weight forward and lets your emergers hang naturally below it.
Fish this rig under a small thespio or pencil indicator in the deeper, slower water: the soft seams where the current slides behind boulders, the soft inside bends, the deeper slots where the channel narrows. At 390 CFS, you have real water column to work. Don’t fish the thin, bright flats; the trout won’t be there in daylight, and the water is too clear to hide your presentation. Hunt the defined holding water — the places where trout have a reason to sit and wait for food.
Mend aggressively and set up for a dead-drift that lasts six to ten feet. This tailwater’s trout feed on the drift, not on the swing or the hang. Let your flies tumble naturally, tick the bottom if you can without snagging constantly, and keep the indicator tracking the speed of the current. When you see hesitation — not always a dramatic strike, often just a slight pause or tilt — set immediately with a short, firm lift. Many takes are soft; hesitation is your trigger.
Streamer Time: The Brown-Trout Angle
October is when the big browns below the dam begin their pre-spawn behavior. They’re not spawning yet (that ramps through November), but they’re pushing into deeper slots and moving with more intention. If you want to fish streamers — and on a water this clear and this cold, early morning and late afternoon are prime — go with black or olive patterns in sizes #4–8: Woolly Buggers, black Marabou Muddlers, or dark Zonkers. Cast across and strip slowly, letting the fly swing and hang. The key is patience; these fish aren’t chasing aggressively, but they will move for a slowly worked streamer if it crosses their line of sight.
Water Temperature and Fish Welfare
At 59°F, the water is in excellent shape, and there’s no temperature concern this week. Trout are comfortable and feeding across their normal range. But understand that this is a tailwater running off deep reservoir water — the temperature will fluctuate based on dam release depth and time of year. As we move into late fall and early winter, the water will stay consistently cold, which is one of the great gifts of fishing the Pueblo tailwater in winter. Just the same, always carry a thermometer, especially as conditions shift.
The Logistics: Access and Regulations
This Gold Medal water runs special regulations on its upper section immediately below the dam. Before you fish, verify current specifics — bag limits and fly-only/catch-and-release zones vary by sub-section and change year to year. The lower sections are often more permissive, but don’t assume. The tailwater itself runs through and below the city of Pueblo; access points are distinct and finite. Know your entry and exit, and respect posted boundaries.
This Week’s Bottom Line
390 CFS is workable, wading-friendly water on the Pueblo tailwater. The temperature is cool, the clarity is high, and the hatch is small and specific. Downsize your flies, use light tippet, hunt the defined holding water, and fish the emerger drop with precision. This is classic tailwater fishing — technical, thoughtful, and productive if you slow down and match the water’s actual behavior rather than the water you wish it was.