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Low Flow, Warm Water — Fish Smart This Week
We’re sitting at 69 CFS right now, and that’s a meaningful detail on Eleven Mile. This water’s typical range runs 50–150 CFS, so you’re at the low end of baseline — not a crisis, but not a wide-open opportunity either. The real consequence is twofold: the river concentrates, which means fish are predictable but also more alert to drag and poor drifts, and in August, low flow plus shallow water means temperature stress creeps in fast.
That 69 CFS is sustainable for now, but if you’re fishing midday, water temps will climb into the upper 60s by afternoon. The canyon road sits close enough to the water that you’ll notice the sun hammer those pools hard by 2 p.m. Plan to fish the early morning window (first two hours after first light) and then again from late evening through dark. Midday wading the shallower pocket sections is worth skipping — both for fish welfare and because they’ll be spooky and hard to fool in thin, clear water under bright sun.
Midges and Tricos Lead; Caddis in the Slot
August’s primary hatch on Eleven Mile is still the midge, and at this flow, that’s not a complaint — it’s your bread-and-butter all day. Black Beauty emergers and mercury midges in #20–24 will draw steady takes in the softer current edges and the slower pools, especially during the warmest part of the day when larger insects are dormant. Fish them as emergers: a #22 Barr’s-style midge emerger or zebra midge suspended 14–18 inches below a heavier anchor fly (a small nymph or #18 hare’s ear to track depth).
Trico spinner falls have already fired up by early morning — look for the white-winged spinners on the water starting around 7 a.m., though the heaviest fall is typically compressed into a tight 45-minute window before the water warms. Small counts, but worth a dry-fly rod if you’re there at first light. Tie on a #22–24 Trico spinner (traditional black or dark dun) and fish the slower-moving pools and the soft glides where spent spinners collect. Expect refusals on the first cast; these fish have seen a lot by August, so a drag-free drift matters more than the fly itself.
PMDs are still present in the afternoon, but they’re sporadic — not the reliable hatch of July. A #16–18 PMD emerger fished in the same split-shot rig as your midge dropper will pick up the occasional fish, but don’t stake your day on it.
Caddis begin in earnest by evening, usually after 6 p.m. when air temps cool slightly. Fish a #14–16 elk-hair caddis or tan x-caddis in the slack water behind the larger rocks and along the cut banks where the current slows. These evening windows are long — you can fish until dark — and the fish are less spooky as light fades.
Terrestrials (ants, small beetles, and hoppers) are active on warm afternoons, but again, at 69 CFS and with water temps already climbing, afternoon wading is a tough call. If you do fish midday, a small black ant (#16–18) or a #14 hopper bounced tight to the banks in the pocket water can draw violent takes. Just keep it short: an hour or two, then rest the river.
The Rig That Works at This Flow
At 69 CFS, the water is clear and thin enough that your line and fly selection need to be sharp.
For the midge program (which is where you’ll spend 60% of your time): Start with a small anchor fly — a #18 hare’s ear, a #16 pheasant tail, or a small jigged nymph — on your main line. Tie on 4X tippet to the anchor (Eleven Mile’s clarity doesn’t demand 5X for this, and the anchor needs to hold weight). Add a single split shot about 10 inches above the anchor, then tie a 5X tippet tag (roughly 18 inches) and attach your emerger — #22 zebra midge or #22–24 Barr’s emerger — directly to that tag. This setup keeps your emerger riding naturally in the film without spinning, and the split shot stays high enough that you’re not dragging on every pulse. Fish the deep slots (the darker pockets between and below the main current seams), letting the rig swing and tick the bottom for two to three seconds on each drift.
For the dry-fly window (Trico spinners, caddis evening): Go with 5X tippet and a single fly. The water is gin-clear, and 5X is fine here; the thin tippet actually helps with drag-free drifts on the slower glides. Cast upstream and let the fly dead-drift with no tension.
For terrestrials in pocket water: A 4X tippet and a #14–18 fly on your main line, no dropper. You’re flicking these into tight spots, and a single fly is cleaner and less likely to hang on the willows.
Tippet material: Use fluorocarbon for nymphs (better sink rate and sensitivity on the tight-line style that works here at low flow) and standard monofilament for dries (better float, better turnover on small flies). The difference matters when you’re fishing to concentrated, cautious fish.
Access and Water-Temp Stewardship
The 3.8-mile Quality Waters section from the dam down to Wagon Tongue Gulch Road is your zone. The roadside access is one of Eleven Mile’s best features — pullouts are frequent enough that you can wade in, fish a half-mile of river, and move on without committing to a long hike. Use that: at low flow and warm temps, hit the cooler, deeper pocket sections early, and work systematically downstream. Don’t camp in one pool for two hours.
Remember the $11 per-vehicle day-use fee at the entrance station — it’s a US Forest Service fee for Pike-San Isabel National Forest, separate from any state park pass. The annual $100 pass pays for itself fast if you’re here more than a handful of times a summer.
At 69 CFS and August heat, fish welfare is real. If water temps are pushing into the upper 60s (touch the water — you’ll feel it), prioritize early and late windows, keep your releases quick and in the water, and think twice before fishing hard during midday. The fish will be there in two hours when the sun angles lower.