Fishing Report: South Platte River at Cheesman Canyon 8.1.24

August Fishing Report: Cheesman Canyon

Current River Conditions

The South Platte River at Cheesman Canyon is currently flowing at 258 CFS, providing excellent fishing conditions. Water temperatures range from the low 40s in the morning to mid-50s by the afternoon due to releases from Cheesman Reservoir. These controlled releases help maintain optimal water conditions for trout throughout the summer​ (Colorado Division of Water Resources)​​

The recent high flows earlier this summer, averaging between 600-700 CFS, were necessary to manage sediment and maintain reservoir levels. These flows have helped clear out sediment from the canyon, improving habitat quality for aquatic life. Cheesman Reservoir is at full capacity, ensuring a steady release of cool, oxygen-rich water into the river. 

Due to the high snowpack and subsequent runoff, the river has experienced periodic spikes in flow, occasionally reaching up to 900 CFS. These fluctuations have been essential in flushing out decomposed granite and other sediments that had accumulated in the riverbed. Despite these high flows, the river has now stabilized, providing a more predictable environment for anglers​ 

Weather conditions have been favorable, with clear skies and calm winds forecasted for the coming days. Highs are expected to remain in the mid-80s, with occasional afternoon showers. Anglers should be cautious of potential flash floods caused by heavy rains, which can significantly impact river conditions and safety.

The diverse habitat in Cheesman Canyon, characterized by deep pools, riffles, and runs, supports a healthy population of trout, including rainbow, brown, and cutthroat trout. Combining optimal flows, stable water temperatures, and effective sediment management has resulted in excellent fishing conditions. 

Hatches and Fly Patterns

Key hatches this time of year include midges, Blue Wing Olives (BWOs), caddisflies, and Pale Morning Duns (PMDs). Recommended fly patterns for successful fishing include:

• Nymphs: Foamback Emerger (sizes 20-22), Sparkle Pupa (size 16), Barr’s PMD Emerger (sizes 16-18), San Juan Worm (size 10), Soft Hackle Pheasant Tail (sizes 16-18).
• Dries: Mole Fly (size 22), Vis a Dun (size 20), Elk Hair Caddis (sizes 14-18), Chubby Chernobyl (sizes 10-12), Foam PMX (size 10).
• Streamers: Woolly Bugger (sizes 6-10), Sculpzilla (sizes 6-10), Baby Gonga (size 6), Mini Dungeon (size 8)​ 

Fishing Tactics

• Nymphing: Nymphing remains the most productive method. Adjust your depth and weight to match the current conditions and focus on seams, riffles, and runs where fish are likely feeding. Effective patterns include the Pheasant Tail, Hare's Ear, and Prince Nymph.
• Dry Fly Fishing: Dry fly fishing is also effective during hatches, particularly in slower seams and back eddies. Patterns such as the Blue Wing Olive and Pale Morning Dun can be very productive.
• Streamer Fishing: Use larger streamers to target big fish in deeper waters. Techniques such as dead drifting or stripping can be effective depending on the fish's behavior​ 

Best Spots

Popular access points include:

• Cheesman Canyon Trailhead: Provides easy access to prime fishing spots with deep pools and riffles.
• Gill Trail: Offers access to various sections of the canyon, known for holding large trout.
• Bridge Crossing: Ideal for anglers seeking a mix of calm and fast waters​ 

For real-time data on river conditions, visit the Colorado Division of Water Resources.

Safety Tips

Given the current flows and temperatures, wading can be hazardous. Always inform someone of your plans and avoid crossing the river at unsafe points. Use proper gear, such as a wading staff and boots, to maintain stability in the water. The swift currents can be dangerous, so exercise extreme caution​