Open 9 a.m. to 6 p.m. daily

Report Date: 10/21/2026

Conditions:

The USGS stream gauge directly below Cheesman Lake is reading in the low 50 CFS range. With water levels receding, flows are low, stable, and glass-clear. Resident trout are holding tight in deep pools, plunge slots, primary seam lines, and along submerged granite drop-offs. Brown trout continue actively staging on shallow gravel tailouts and low-velocity margins for the fall spawn; anglers should avoid targeting actively spawning fish and refrain from wading across or stepping on delicate redds. Focus all effort on deeper holding water where non-spawning fish gather.

Weather:

Short-term

High-country fall weather over the next 3 days will bring daytime highs hovering in the low-to-mid 60s under partly cloudy to overcast skies. Dawn starts will remain crisp and cold, with morning temperatures dipping into the 30s to low 40s. Light to moderate winds will build to 8 to 14 mph along the canyon floor by early afternoon, stirring up gentle surface chop across quiet pools that helps break up line shadows.

Long-term

Over the next 10 days, extended forecasts point toward a noticeable autumn cooling trend across the upper South Platte corridor. Highs will gradually step down into the upper 40s and 50s, with overnight lows consistently dropping into the upper 20s and low 30s—including a brief spell of light high-elevation snow showers passing through the region. Steady tailwater releases will preserve stable subsurface water temperatures, keeping feeding trout active in their deeper winter lies despite fluctuating air temperatures.

Hatches:

Cream, black, and olive midges remain the primary year-round dietary staple, hatching continuously through the morning and early afternoon. Fall Blue-Winged Olives emerge during overcast or drizzly afternoons, creating subtle dry-fly windows in soft tailouts and foam lines. Terrestrial activity has effectively wound down with cold morning frosts, shifting trout focus primarily on subsurface aquatic insects.

Tactics:

These low 50 CFS flows demand maximum stealth, low silhouettes, and minimal wading through crystal-clear water. Lengthen leaders to 9–12 feet and downsize tippet to 6X or 7X fluorocarbon to eliminate micro-drag. Focus deep-nymphing efforts exclusively on primary plunge pools, shaded pocket water, and deep granite ledge drops rather than shallow flats. Subtle yarn or micro-putty indicators paired with minimal weight  will prevent spooking skittish fish upon landing.

Tips:

This is an area where we offer guided fly fishing trips. We are one of two outfitters permitted to operate in Cheesman. There is no better way to learn an area like Cheesman Canyon than hiring one of our Orvis-endorsed professional guides!