In this report
Low Flow, High Heat: Read the Water Carefully This Week
We’re sitting at 94 CFS on Eleven Mile right now—well below the typical 50–150 range and noticeably below the 150–250 band where dry-fly fishing feels effortless on this canyon. At this level, you’re not looking at a sweet spot. You’re looking at concentrated fish in a narrower band of good water, warmer temperatures creeping into the stream, and a week that demands precision over optimism.
What that means on the ground: the pocket water and shallow runs that usually hold fish are thinner. The pools are your primary target. The fish that are there are holding tighter to structure and shade because the water is warming—we’re in early July, the canyon walls trap heat, and 94 CFS with afternoon sun means the South Platte’s thermometer is likely already in the mid-60s by midday. That’s a stress threshold for wild trout. Fish early, fish shaded pockets, and consider moving off the water during the hottest part of the afternoon rather than grinding low-probability runs.
Wading is straightforward at this flow—no surprise there—but current is weak enough that your drift window is smaller. You’ll need tight lines and precise mending to keep drag off a small fly. If you’re accustomed to swinging nymphs with slack line and letting the river do the work, this week you’re managing every foot of drift.
Midges, Then Tricos; Caddis in the Evening Slot
Eleven Mile is a tailwater, and tailwaters in July run on midges first and everything else second. You’ll see midges emerging all day—#20–24 black or olive patterns (Black Beauty, Zebra Midge, Mercury Midge, or RS2 emergers). Fish these subsurface in the morning and under a small indicator or tight-line setup throughout the day. They don’t hatch heavy at once; they’re a constant trickle, which at low flow means you can pick individual feeding trout rather than wait for a blanket rise.
By mid-morning, watch for Trico spinner falls. Yes, we’re early in the summer for peak Trico, but the hatch shows up here every morning in early July, and the spinners come back down to the water around 8–9 a.m. Sizes #22–24, tied sparse—the natural is tiny and in low water, a bulky imitation spooks fish before they eat it. Olive or black bodies. You won’t get a blitz, but you’ll get consistent risers if you’re on the water early and stay quiet.
PMDs (#16–18) are still around in the afternoon—an emerger pattern fished subsurface will catch fish in the slower pools. The heat might suppress activity compared to earlier in the summer, but they’re here.
In the evening, caddis appear, especially in the last two hours before dark. Smaller tan or olive patterns (#16–18) on a dead drift or a subtle strip in the quieter water along the canyon walls. Low flow means caddis aren’t roaring, but they’re enough to bring fish up if the water cools slightly as the sun drops.
Finally: terrestrials. By July, ants and beetles are real options on warm afternoons, especially if you’re fishing the shaded pockets near the canyon walls. Small patterns (#16–18), nothing flashy, and fish them gently in the current seams. Don’t force it if fish aren’t looking up, but have one ready.
How to Rig and Where to Fish
The rig: Start with a small anchor fly—a #20–22 midge emerger (RS2 or equivalent) tied to your main line. Add 12–18 inches of 5X or 6X tippet and hang a #18–20 PMD emerger or a second midge pattern below it. At 94 CFS, you’re not fighting current, so weight is minimal—a single small split shot pinched on the tippet 2 inches above the dropper, or rely on the fly’s own weight and a slow, methodical drift. If you’re using an indicator, go small (a tiny yarn or foam bit, nothing that yells) because fish spook easily in low, clear water.
Tight-line nymphing is probably your bread and butter this week: no indicator, just direct contact with the fly via a slightly slack upstream mend and a dead drift through the likely zone. It feels “blind,” but at 94 CFS in pools and deep pockets, you’ll hook fish you never saw. Mend every 3–4 feet to keep drag minimal.
Where: Skip the marginal pocket water. Focus on the deepest pools—the ones along the outside bends of the canyon where the river cuts into the bank, and the slower eddies behind rocks in the main run. These are the refuge zones when the flow is low and the sun is high. Early morning, fish the shallower pockets near your access point while the light is soft and the water is coolest. As the day warms, retreat to the deeper slots and the shade of the canyon walls themselves.
Access, Fees, and Fish Welfare
The $11 day-use fee gets you into the canyon—the Forest Service entrance station at the top. No Colorado State Parks pass covers this; it’s Pike-San Isabel National Forest, and the fee is separate. Bring cash or a card. The pullout access along the old railway grade makes Eleven Mile less of a haul than some of the foot-only canyons upstream, which is a genuine advantage on a week when heat stress is real.
Speaking of stress: at 94 CFS in early July, consider your timing carefully. Morning sessions from first light until 10 or 11 a.m. will be more productive and easier on the fish. The afternoon grind on low water in heat is a choice, but it’s a choice that exhausts wild trout faster than you might realize. Fish early, fish shaded water, and if the sun is fully on you and the water feels warm to the touch, move to the shade or call it a day. The canyon will be there tomorrow, and so will the trout—if we don’t stress them now.