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LOCAL WATER. LOCAL KNOWLEDGE.

Cheesman Canyon Fishing Report

South Platte River · Below Cheesman Dam, Colorado

Plan your day in Cheesman Canyon with fishing conditions, river flows, suggested flies, and practical advice from Blue Quill Angler.

ON THE WATER

Current fishing report

Report updated

Cheesman Canyon is extremely low following a substantial reduction in reservoir releases. Current outflow is near 51 cfs, far below the volume that spreads fish throughout the canyon's riffles and pocket water. The remaining depth concentrates trout in pools, slots and sheltered seams, while clear water exposes poor drifts and careless approaches. Morning midge activity has been the most reliable feeding opportunity, with occasional tiny blue-winged olives later in the day. Small larvae and emergers are more sensible than large attractors, and a dry is worthwhile only when fish visibly rise. These conditions call for restraint: avoid repeatedly working crowded holding pools, keep wading to a minimum and protect clean spawning gravel. Check releases before hiking in, since even modest changes can alter the limited fishable water.

Fishing tips

Use a light, short nymph rig with Mercury Black Beauty #20–22 and Mercury RS2 #20–24. Add Juju Baetis #20–22 where Baetis appear. Watch for subtle midge rises; protect redds and give concentrated trout room.
Pat Dorsey

FROM OUR HEAD GUIDE

Pat Dorsey's Guide Report

Pat's report revised

Tips & Other Information

Outflows were decreased to 51 cfs below Cheesman Reservoir in an effort to conserve water.  Cheesman Reservoir is currently at 64% capacity as of this morning.  The mayfly hatches have been light but we are seeing a few Pseudocloeons (Tiny BWO’s).  The morning midge-bite is the best part of the day.  Midge larvae (Mercury Midge, pale-olive larva, etc.) have been my top producers as of late.  There have been fish eating midge adults in the shaded areas in the glassy pools and tailouts. Small Parachute Adams and Mole Flies have been the best producers.

14-Day Hatch Outlook

Outlook from Pat's report dated November 4, 2026; not a live weather forecast.

Look for hatches of midges and blue-winged olives.

Effective Patterns

#20-22 Top Secret Midge, #20-22 Manhattan Midge, #20-22 Jujubaetis, #20-22 Top Secret Baetis, #20-22 Chocolate Foam Wing Emerger, #18 Micro San Juan Worm, #20-22 Red Larva, #20 Mercurry Blood Midge, #20-22 Flashback Mercury Black Beauty, #18-20 Buckskin, #18-20 Sparkle Dun (BWO), #22-24 CDC Biot Trico Comparadun, #18 Sparkle Dun(PMD) #14-16 Elk Hair Caddis, #10 Amy's Ant, #20-24 Griffith Gnat, #18-22 Mole Fly, and #20-22 Parachute Adams.

Looking for flies for this river? Shop BQA's recommended flies ↓

KNOW BEFORE YOU GO

River conditions

Flow readings update separately from the fishing report. Check the reading time shown below.

BUILD YOUR FLY BOX

Recommended flies for Cheesman Canyon

Selected by the Blue Quill Angler team for fishing Cheesman Canyon. See the fishing reports above for specific patterns, sizes, and techniques.

Match patterns and sizes to the report above and the feeding activity you observe.

PLAN YOUR DAY

Fishing Cheesman Canyon

The fishery

Cheesman Canyon is a hike-in section of the South Platte below Cheesman Dam. Granite boulders, deep pockets, shelves, and narrow feeding lanes create demanding water for brown and rainbow trout. Clear water and sustained fishing pressure reward patient observation, careful approaches, and accurate presentations. Nymphing is a dependable starting point, with opportunities for dry flies when trout rise during a hatch. Choose your fishing position before entering the water and keep unnecessary wading to a minimum.

Access & parking

The Gill Trail provides hiking access into Cheesman Canyon. Plan for uneven terrain and additional time to reach the river and return to your vehicle. Use designated parking, follow established trails, and respect posted boundaries and private property. Carry drinking water, weather protection, and appropriate footwear. Check current trail conditions and closures before leaving, and choose river-entry points carefully rather than scrambling down unstable slopes.

Seasons & techniques

Midges provide an important food source throughout the year, while Baetis create seasonal opportunities for small nymphs, emergers, and dries. Warmer months can bring additional mayflies and caddis. Observe insects and feeding behavior before selecting a presentation. In clear water, a controlled drift and precise depth adjustment often matter more than repeated fly changes. Reservoir releases influence fishing conditions, so check the current flow rather than relying on a fixed seasonal expectation.

Regulations & river care

Cheesman Canyon is managed as catch-and-release water. Check current Colorado Parks and Wildlife regulations for the exact reach and follow posted restrictions. Keep fish in the water while unhooking them, minimize handling, and avoid fishing to spawning trout or walking through redds. Give other anglers room and use established trails to protect streambanks. Changing releases, slippery rocks, and deep pockets require cautious wading; a familiar crossing may become unsafe when flows change.

PLAN YOUR VISIT

Location & access

Open in Google Maps (opens in a new tab)

Cheesman Canyon Trailhead / Gill Trail access off County Road 126. This marker identifies the trailhead, not riverside parking. Follow the established trail into the canyon and allow time for the return hike.

Use the marked location to plan your visit. Follow current signs, access boundaries, parking rules, and closures on arrival.

A LOOK AT THE WATER

Along the river