In this report
Low Flow, High Clarity — Fish the Tight Seams This Week
We’re at 105 CFS on Eleven Mile right now, and that’s notably on the lean side even for this water. Your typical range here runs 50–150, so we’re not in emergency territory, but we’re definitely below the sweet spot for dry-fly work and wading comfort. What that means on the ground: the current is slower and more predictable, which sounds nice until you realize it also means fish are spookier, holding in tighter, more defined lanes. The shallow margins that usually hold fish are thinner. The deep slots and pocket water are where the trout are stacking up this week — and they’re feeding selectively because the drift window is narrower and the water clarity is excellent.
Water temperature is the other half of the equation here. Early July on a low-flow tailwater, even one fed from the bottom of a reservoir, can push into the high 50s to low 60s by midday, especially on the few miles of river that see direct sun exposure. Before you hit the roadside pullouts, know that fish welfare matters: if temps are running toward the top of that range, morning sessions and low-light evening fishing will give you more active, less-stressed trout and a better conscience about it. Don’t soak a fish in warm water waiting for the perfect shot.
Midges Remain the Foundation; Tricos and Caddis Emerge
July on a tailwater is midge season with seasonal footnotes. The year-round pattern — #20–24 black beauties, zebra midges, RS2 emergers — is still your bread and butter. But this week you’re also in the window for Trico spinner falls, which on Eleven Mile typically show up in the early morning (think 7 to 9 a.m., depending on light and air temp), and toward evening you’ll see sporadic caddis activity that can pull fish off the bottom if you’re positioned right.
Here’s the tactical piece: at 105 CFS, neither the Tricos nor the caddis are happening in the explosive, river-filling volumes you see on bigger water. The spinners will be scattered and localized, concentrated in the slower, clearer pockets and the wider sections where a few dozen dead flies might actually create a feeding window. Same with caddis — you’ll have a window, maybe 30 minutes, in the fading light, but it’s not a blanket hatch. The midge nymph bite, by contrast, is consistent all day and across all the pocket water and deeper runs. That’s where your high-percentage fishing lives this week.
Rigging for Tight Water and Selective Fish
With clarity and low flow working against you, finesse matters. Here’s what’s working:
Nymph rig (your foundation, 60+ percent of your fishing time): A #20 or #22 RS2 emerger or Barr’s black beauty as your point fly, 18 to 24 inches below a heavier anchor — a #16 or #18 pheasant tail or Hare’s Ear, something with a bit of flash or contrasting thorax to track and to serve as a weight carrier. Add one small shot (split-shot, not tungsten putty) about 6 inches above the point fly, placed so it doesn’t slip. You’re aiming to dead-drift along the bottom of the deep slots, where current slows and trout don’t have to chase. On this water, the deep runs are your zones — they’re not wide, but they’re consistent, and at 105 CFS the trout have nowhere else to be.
Indicator: use a small foam or yarn indicator, set 1.5 to 2 times your water depth. The water is clear, so even a small indicator won’t spook fish in the deeper lies — it’s the shallow margins where visibility is a problem. Keep the indicator small and dark (gray or black over chartreuse) so it doesn’t create a silhouette.
Tippet: 5X on this whole rig. The low flow and clarity demand it. You’re working small flies and tight quarters; 5X won’t hamper your casting at Eleven Mile distances (you’re not reaching across 40 feet of river here), and the thinner diameter makes a huge difference in how naturally your emerger rides when fish are examining every detail.
Dry-fly setup (early morning, Trico window, and evening caddis): If you’re swinging a dry for Tricos (unlikely to be prolific, but possible), go #20 or #22 Trico spinner — CDC or parachute, not a large profile. Ahead of it on 5X tippet, consider a #22 midge dry as a searching pattern if you’re casting blind. For evening caddis (a #16 or #18 tan or gray caddis), fish it with a dropper: a #20 emerger about 20 inches back. The dropper often outproduces the dry on this water anyway, especially when caddis are in the air but not all the way to the surface.
Where to Position Yourself
Roadside access is your friend on Eleven Mile — you can pull over, glass the water, and move without a long hike. This week, key on the deeper pocket-water sections where the canyon narrows and the current accelerates around boulders. Those slots might only be 4 to 6 feet wide and 2 to 3 feet deep, but they’re holding fish because the slower edges of a tight current seam are oxygen-rich and easier to hold in low flow. Wade the margins carefully; your footsteps carry in clear water. Work your indicator rig through the slowest edge of those seams first, letting it bounce and dance just above the substrate. Often the take comes on the swing, as your flies lift slightly coming out of the drift.
Wider, flatter pools — the kind that usually look pretty and inviting — are actually harder this week. Fish are spread out and spooky in shallow, clear water. You’ll catch fish there, but you’ll work harder and likely take longer to find them. Your time-to-fish ratio is better in the defined, darker pockets.
Access and River Care This Week
The day-use entrance fee is $11 per vehicle. Have it ready at the entrance station; this is a US Forest Service property (Pike-San Isabel NF), and your Colorado State Parks pass does not cover it. If you’re a frequent visitor, the $100 annual pass is worth it.
Low flow and warm conditions mean fish are already slightly stressed. Keep your release times short, wet your hands or use a net, and avoid high-altitude air exposure. Early morning and evening sessions are not just better for fishing — they’re also better for fish welfare.