South Platte tricos click as Colorado tailwaters run low and clear

What's biting

What's next

With no updated USGS or NOAA readings in hand for either the South Platte or the Arkansas this cycle, the safest planning assumption is a continuation of the low, clear, technical summer flows both tailwaters are known for in a drought year like the one Pat Dorsey Fly Fishing (CO) has been documenting. Expect water to keep warming through the afternoon hours as July sun builds, which pushes the best window toward first light and again into the evening shadow.

Trico spinner falls, the pattern Gink and Gasoline built an entire memory around from the South Platte, typically fire in the mid-morning once the sun has been up a couple of hours, so anglers should be rigged and positioned before the bugs start stacking on the surface. As the drought persists and flows stay thin, expect fish to bunch into the deeper, more oxygenated runs and pool heads, particularly below dam releases, making precise, downstream drag-free drifts with small midge and trico imitations more important than covering water.

AvidMax Blog's tailwater-tuned patterns, the Chocolate Foam Back midge emerger and the Titan Tube Midge built for clear, cold conditions, are both reasonable bets to have in the box over the next few days given the technical, low-water read on both rivers. A jigged Euro-nymph rig, like the CDC Pheasant Tail Tungsten AvidMax profiled, is worth carrying as a searching pattern for faster riffles and pocket water where sight-fishing to risers isn't an option.

On the South Platte's Dream Stream stretch, Colorado Trout Hunters' notes on migratory, lake-run brown trout are mostly a fall and spring story, but the stretch is worth checking through summer for holdover fish using deeper structure to escape the heat. If the drought pattern holds through the weekend, expect increasingly technical, low-and-slow conditions on both tailwaters rather than any dramatic shift. Anglers planning a weekend trip should build around the coolest hours, treat midday as a break, and watch for any voluntary fishing closures or hoot-owl style restrictions Colorado agencies sometimes issue during sustained low flow and high water temperature stretches, always checking current state regulations before heading out.

Context

Mid-July on the South Platte and Arkansas tailwaters is usually trico season, a reliable annual event anglers plan whole trips around, and Gink and Gasoline's account of the South Platte's dense spinner falls lines up with that typical seasonal rhythm rather than describing anything unusual. In that sense, this year's hatch timing reads as roughly on schedule.

Where 2026 stands out is water. Pat Dorsey Fly Fishing (CO) has been characterizing this year's drought as among the more severe stretches Colorado has experienced, comparing it to notable low-water years like 2002, 2012, 2018, and 2020. That context matters for tailwater fisheries specifically, since dam-controlled flows can be managed to protect downstream reservoir storage during drought years, which in turn affects how much cold water tailwater trout have to work with through the heat of summer. Anglers who fished these rivers in past drought years will recognize the playbook of skinnier flows, warmer afternoons, and fish concentrating in the most reliable cold-water refuges.

Colorado Trout Hunters' Dream Stream reports describe recent fall and spring migratory runs as some of the better seasons they have seen in a while, a positive signal for the fishery's overall health even though that specific run doesn't apply to a mid-July window.

No buoy or gauge telemetry was available for this report, so there is no hard year-over-year flow or temperature comparison to offer beyond what the angler intel describes. Treat the drought framing as the most reliable comparative signal available right now, and expect it to keep shaping how these tailwaters fish through the rest of summer.