Western Slope rivers fish low and clear as fall settles in

What's biting

What's next

Expect the same low, clear pattern through the next few days. Field & Stream notes that blue-winged olives dominate fall mayfly hatches, and suggests parachute and Compara-dun patterns on long leaders of 12 feet or more, tapered to 6X or 7X. If the weather turns gray or wet, they say to shift to nymphs or big orange caddis.

Plan around the warmest part of the afternoon for olive activity, and fish the early hours with small midge and nymph rigs. The 55°F reading at gauge 09095500 is a good sign for active feeding, and the cooler water should keep fish comfortable through midday. Colorado Trout Hunters reports that tailwaters managed for steady flows have held up best through this dry year, so those are the places to start if freestone water looks thin.

Brown Trout are the fall story. Colorado Trout Hunters describes a strong autumn migratory brown run on the Dream Stream, which they say has since pushed back toward the reservoir, so treat that report as a seasonal marker and not a current bite.

Context

This is the back half of the fall brown trout season in the Colorado high country. Falling temperatures usually bring more consistent baetis hatches and a shift toward streamers and nymphs, and the 2026 drought has left many rivers running leaner than normal for the date. Pat Dorsey Fly Fishing calls it one of the worst low-water years on record, so lighter presentations and careful wading are the norm rather than the exception. As always, check Colorado Parks and Wildlife regulations and any voluntary closures before heading out.