Low, clear Colorado tailwaters set the tone for fall trout

What's biting

What's next

Expect the fall pattern to keep tightening. As flows stay low, Crystal Fly Shop says flies generally downsize and fish push off the banks, so stealth and long, light leaders matter more than fly choice. Midges and small mayflies should carry the day, and the cool nights suggest the best window is late morning into mid-afternoon, when water warms a few degrees and insects get moving.

On the Colorado River below Glenwood Springs, Crystal Fly Shop describes the streamer bite as pretty decent when the water is off-color. With the mainstem gauges running at 982 and 1,570 cfs and temps in the upper 50s, fish should hold in softer seams and deeper runs. Cutthroat Anglers (CO) and Pat Dorsey Fly Fishing (CO) both urge anglers to quit fishing when water reaches the high 60s. That is unlikely this week, but it is the line to watch on any warm afternoon. Check for voluntary closures and state regulations before heading out.

Context

Mid-October is typically the shoulder between summer low-water fishing and the colder midge-driven winter pattern. This year Pat Dorsey Fly Fishing (CO) calls the 2026 drought among the worst on record, and Colorado Trout Hunters points to tailwaters as the most reliable option. Brown Trout in many Colorado systems typically move toward spawning behavior around this time, so give redds room and avoid wading in spawning gravel. Expect lean flows to persist, which keeps the game about subtle presentations rather than big water.