Low water sharpens the midge and trico game on CO tailwaters

What's biting

What's next

With flows running low across Colorado's tailwaters, the next few days should keep following the same script: cool mornings with a solid feeding window, followed by a fast slide into tougher, heat-stressed conditions by midday. Cutthroat Anglers (CO) has been direct about this pattern all season, and their guidance to stop fishing once water temperatures climb into the upper 60s (°F) is worth building a trip around rather than reacting to after the fact. Plan to be on the water at first light and off it, or moved to shadier, faster, more oxygenated runs, well before early afternoon.

The trico spinner fall that Gink and Gasoline describes on the South Platte is a dependable late-July into September event, and if the pattern holds, anglers should see it repeat most mornings through the coming week, typically starting an hour or two after sunrise once the spinners begin dropping to the water. Small emerger and spinner patterns in the surface film, fished on light tippet, should keep producing during that window. Once the spinner fall tails off, expect the bite to shift subsurface, with AvidMax Blog (CO)'s midge emerger and jig-nymph patterns (foam-back emergers, tungsten jig nymphs) doing the work through the rest of the morning.

Given Pat Dorsey Fly Fishing (CO)'s framing of 2026 as a severe drought year, don't expect flows to rebound meaningfully without a significant rain event, so the low-water, technical-presentation game is likely the baseline for the foreseeable future rather than a short-term blip. That favors stealth, longer leaders, and downsized flies over searching water aggressively.

With a full moon tonight, low-light periods around dawn and dusk are worth leaning into a bit harder than usual, since bright overnight conditions can shift some feeding activity earlier or later at the margins. Weekend anglers should treat early morning as the priority window rather than midday, both for water-temperature safety and for the trico window described above. No direct South Platte or Arkansas flow or temperature readings were available for this report, so treat timing windows as general guidance and check current gauge data before committing to a plan.

Context

Drought is not a new theme for South Platte and Arkansas tailwater anglers, but the intensity being described this season stands out. Pat Dorsey Fly Fishing (CO) frames 2026 against a personal record stretching back over six decades, noting prior notable low-water years in 2002, 2012, 2018, and 2020, and calling the current drought potentially the worst on record. Cutthroat Anglers (CO) independently corroborates that framing, citing more than 60% of the Lower 48 in some level of drought and historically low western snowpack feeding directly into early, elevated water temperatures on Colorado rivers this year. Two independent Colorado shops describing the same severity is a stronger signal than either alone.

What's notable is that both sources frame this as workable rather than a lost season: fish concentrate in the remaining deeper, cooler water, and anglers who adjust, fishing early, going smaller and lighter, and covering less pressured stretches, are still finding good numbers. The South Platte's trico hatch described by Gink and Gasoline is a long-standing late-summer feature of this fishery and appears to be running on a normal calendar this year, which is a useful anchor point given how much else about 2026's water year is abnormal. Beyond that, there's no direct comparative flow or temperature data in this report to say definitively whether South Platte and Arkansas conditions are running early, late, or on pace relative to a typical year, so that comparison should be treated as general seasonal context rather than a hard data point.