Low, clear Colorado tailwaters set up fall dry-fly and streamer windows

What's biting

What's next

Expect the cool water to hold through the week, and with temperatures well under the 67 to 68°F cutoffs that Pat Dorsey Fly Fishing and Cutthroat Anglers (CO) urge anglers to respect, fish should stay comfortable through the afternoon. The lower flows on gauge 391953108130201, at just 3.81 cfs, mean small tributary water is very thin and best left alone.

Plan around the warmest part of the day for dry-fly windows, when midges and BWOs typically stack up. Early mornings and low-light overcast periods favor streamers and dark, high-contrast nymphs, in line with MidCurrent's note that purple nymphs shine on overcast days. If water turns muddy after rain, as Crystal Fly Shop reported on the Colorado earlier, switch to bigger, darker streamers and give clearer tailwaters priority.

Context

This is the heart of the fall transition for Colorado rivers. Cooling nights typically drop water temperatures and bring on BWO and midge hatches, while Brown Trout begin pre-spawn movement and become more aggressive toward streamers. Colorado Trout Hunters describe a fall migratory brown run on the Dream Stream that has now ended, as fish headed back to the reservoir.

This year the backdrop is a record-dry one. Pat Dorsey Fly Fishing calls it among the worst droughts on record, with tailwaters remaining the best option. Cooler autumn conditions are giving trout relief that summer did not, so the season is arriving roughly on schedule, though flows stay lower than normal. Check state regulations and any voluntary closures from Colorado Parks and Wildlife before heading out.