In this report
Flow is Low—Fish Are Concentrated, but Spooky
We’re sitting at 69 CFS, and that’s genuinely light for Eleven Mile, even by this canyon’s modest standards. The typical range here runs 50–150, so we’re in it, but barely; ideal dry-fly water doesn’t show up until around 150 CFS, and we’re well south of that. What this means in real terms: the trout are bunched tight in the best holding water—the deeper slots, the inside bends, the pockets behind structure—because there’s nowhere else to sit comfortably. That’s good news for precision casting and knowing where to look. It’s bad news for slop and sloppy approaches. Every footfall matters. Polarized glasses aren’t optional. Wade deliberately, keep your shadow off the water, and expect fish to bolt from water that looks perfect but isn’t deep enough to give them a refuge.
The low flow also means the water is slower to cool in the afternoon. We’re at 58°F right now, which is fine for October, but in that marginal zone where midges and small emergers will outproduce anything bigger. Aggressive stripping, high-profile dries, and noisy presentations are going to hammer fish in shallow water and spook everything in the slots where they’re hiding. This is a soft-touch week.
Midges Rule; BWOs Are Secondary
October’s primary hatch on Colorado tailwaters is the midge, and Eleven Mile is no exception. Expect steady emerger and adult activity from mid-morning into early afternoon on any gray or overcast window. The fall Blue-winged Olives (#20–22) will show up on gray days, but they’re the bonus act, not the headliner.
Go into this week with a solid midge box: Black Beauty, Mercury Midge, and Zebra Midge nymphs in #20–24, plus RS2 emergers (#20–24) and a few small adult patterns. At this flow, midge larvae are going to be the steadiest producer because the water is slow enough that fish aren’t chasing every emerger that drifts by—they’re locked into the seams and taking what comes to them. The emerger bite matters most during the hatch window itself, usually an hour or two midday on gray water.
Don’t sleep on the possibility of a fall BWO window this week if the sky clouds over and stays that way. These are tiny, drab olives, and they’re nothing like the summer mayfly circus. They’re deliberate, sparse, and they drift in the film like afterthoughts. But in low, cold water, every bug counts, and a fish that’s been midge-gorging all morning will absolutely take a #20 or #22 BWO if it’s presented drag-free and in the right lane.
Rig for Depth in Slow Water
At 69 CFS, you’re not dredging, but you’re not fishing shallow either. The best water is still the deepest water—the slots and pools along the roadside pullouts where the river elbows through pocket water—and you need to reach it without crushing the drift or spooking fish on the approach.
Go two-fly, midge-focused:
- Point fly: Barr’s Copper-John or similar #20–22 nymph—an anchor fly with just enough weight to tick bottom in the deeper slots without sinking so fast that it drags.
- Dropper: RS2 emerger or Mercury Midge, #22, set 14–18 inches above the point fly. This is your soft-presentation zone. The emerger rides higher and turns over faster, so it looks less forced.
Weight placement: A single small split shot 8–10 inches above the point fly is enough at this flow. If you’re not touching the bottom once every two drifts in the real deep slots, you’re too high. If you’re snagging every third cast, you’re too heavy. Adjust for the actual bottom texture you’re fishing—bedrock slots need less weight than silted pockets.
Indicator choice: A small yarn indicator (#1 or smaller) set 2.5 to 3 feet above the point fly. At this flow and this water temperature, you can actually fish tight-line if you want—high-stick the seams, feel the take on your rod tip—but an indicator lets you cover more water and gives you a visual reference when a fish is taking the emerger. Both work; choose based on how you read the water best.
Tippet: 5X to the indicator, then 5X to your point fly. This is small-water territory, and your tippet diameter matters on spooky fish. Six feet of 5X below the indicator gives you enough distance to avoid the thick stuff, and the drag properties will be clean enough to matter.
Which Water Holds Fish Right Now
At this flow, ignore the wider, shallower flats. The fish aren’t there. They’re in:
- Deep side channels and inside bends where the river slows and pools between rock. These are your bread-and-butter water. Fish them methodically, letting the nymph swing and hang at the tail of the pocket.
- Pocket-water slots behind and between boulders—the little dark seams you can see from the pullouts. These hold surprisingly good fish and are less pressured than the obvious pools because they take more precision to work.
- Deeper slow water below fast runs, where fish sit in the cushion and wait for food to flush to them. These are easiest to fish and often hold multiple fish, but approach from well downstream and make your first cast count.
Skip the thin, fast water today. It’s not holding anything. The current is too slow for fish to hold in marginal spots.
Access, Fee, and Stewardship
$11 per vehicle at the entrance station (or $100 annual pass). The 3.8-mile Quality Waters section runs from the dam down to the Wagon Tongue Gulch Road bridge. You can fish every pullout along the canyon road—family-friendly roadside access is one of the real draws here—but respect the parking areas and don’t block traffic. Low water and spooky fish mean other anglers will have a harder time. Don’t add to their headache by leaving a vehicle half-off the road.
At 58°F, the fish are fine, but they’re using energy to stay fed and warm. Keep your time on the water short, land fish quickly, and return them to their lies unhurried. A tuckered midge feeder in October won’t bounce back as fast as it will in June.