RIVER REPORT
South Platte River | Cheesman Canyon
The South Platte River in Cheesman Canyon is a world-class fly fishing destination known for its challenging yet rewarding waters and stunning natural beauty. Nestled within a rugged granite canyon, this section of the river features crystal-clear water, technical pocket water, and deep pools, making it home to large, wary brown and rainbow trout. Cheesman Canyon is revered by seasoned anglers for its demanding conditions, requiring stealth and precision. The canyon’s steep cliffs, dense pine forests, and remote location add to its allure, providing both solitude and a sense of adventure. This iconic stretch of the South Platte offers a true test of angling skill in a breathtaking wilderness setting.
CONDITIONS
Weather & Flow Data Reported From OpenWeather and USGS
Recent Reports
South Platte River – Cheesman Canyon – April 2025 Fly Fishing Report: As of late March 2025, Cheesman Canyon is experiencing favorable early spring conditions. Flows are stable, currently around 153 cubic feet per second (CFS), slightly above average for this time of year. These consistent flows have contributed to increased fish activity, with trout spreading into various river areas. Anglers can anticipate hatches of midges in the morning, followed by Blue-Winged Olives (BWOs) in the afternoon. Effective nymph patterns include Beadhead Hare’s Ear, Buckskin, and Soft Hackle Pheasant Tail in sizes 16–18. For midges, patterns like Top Secret Midge and Miracle Nymph in sizes 20–22 are productive. Dry fly enthusiasts may find success with Parachute Adams and Matt’s Midge in sizes 22–26 during active hatches. The river’s clear water necessitates a stealthy approach and precise presentations. Employing light tippets (5x to 6x) is advisable due to the technical nature of the fishery. Focusing efforts during the warmest parts of the day, typically late morning to early afternoon, can enhance success rates. Anglers should also be mindful of spawning activity during this period and avoid disturbing fish on redds to support the health of the fishery. Overall, Cheesman Canyon offers rewarding opportunities for anglers this April, particularly for those who adapt to the technical challenges presented by early spring conditions.
Water Flow Data
5 Day Outlook
BUGS
South Platte River’s insect life provides a smorgasbord for hungry trout. AvidMax recommends these key fly patterns:
THE FISHERY
The South Platte River at Cheesman Canyon offers anglers a legendary and technical tailwater fishery, with gin-clear waters and trophy trout set in the stunning, rugged beauty of a granite-lined canyon.
Fish Species
Cheesman Canyon is renowned for its populations of trophy-sized wild brown and rainbow trout. Trout in this section of the South Platte River can often reach 18-24 inches, making it a prime destination for anglers seeking large fish. The cold, clear water from Cheesman Reservoir provides ideal conditions for these trout to thrive.
Unique Fishing Conditions
Cheesman Canyon offers technical, challenging fishing conditions due to the clear water, cautious trout, and varied terrain. The river features deep pools, fast runs, and pocket water, requiring precise presentations and light tippets (5x-6x). The best fishing occurs in the spring and fall, with strong hatches of blue-winged olives, caddis, and midges. Nymphing with small midge, baetis, and caddis patterns (sizes 18-22) is effective year-round. Dry-dropper rigs and streamers can also work, especially when targeting larger fish.
Access and Regulations
Cheesman Canyon is a protected Gold Medal Waters section of the South Platte River, meaning it is managed for trophy trout. Anglers are required to use artificial flies and lures only, and catch-and-release is encouraged to preserve the large trout population. Access is via the Gill Trail, which requires a moderate hike to reach the river. The hike and rugged terrain keep angling pressure lower compared to other sections, but anglers should be prepared for a challenging fishing experience both in terms of the river and the hike in. Checking flows is important, as water releases from Cheesman Reservoir can affect fishing conditions.
TACTICS
AvidMax encourages anglers to explore their full repertoire on the South Platte River:
Nymphing
Nymphing allows anglers to target trout feeding below the surface, with or without an indicator, making it an effective technique for covering deep runs and slow pools where fish are actively feeding on subsurface insects.
Dry Fly Fishing
Fishing with dry flies provides the ultimate surface experience, imitating adult insects and offering exciting visual strikes, particularly during hatches when trout are feeding on the water’s surface.
Streamer Fishing
Using streamers mimics baitfish and other larger prey, offering an aggressive approach that can entice bigger, predatory trout, especially when fishing deeper water or fast-moving currents.
SEASONS
Each season on the South Platte River brings unique joys and challenges for AvidMax anglers:
Spring
Spring brings high flows from runoff, but Cheesman Canyon remains fishable due to dam-controlled releases. Nymphing with baetis, stonefly patterns, and San Juan worms in deeper pools and seams is effective during this time.
Summer
Summer offers great dry fly action with hatches of caddis, PMDs, and tricos, but the clear water requires light tippets and precise presentations. Fishing early morning and late evening provides the best opportunities for surface takes.
Fall
Fall is prime time for targeting large brown trout moving into the canyon to spawn. Streamers and egg patterns fished near deep pools and structure are highly effective for these aggressive fish.
Winter
Winter fishing in Cheesman Canyon requires focusing on the warmest part of the day, with nymphing small midges and baetis patterns being the best approach. Target slow, deep pools where trout hold during colder months.
REMEMBER
The South Platte River at Cheesman Canyon is a renowned tailwater fishery, offering technical and rewarding trout fishing in a stunning, rugged canyon setting. However, the canyon’s challenging terrain and selective fish demand both skill and respect for this delicate ecosystem.
Water Conditions
Flows in Cheesman Canyon are regulated by releases from Cheesman Reservoir, which can fluctuate dramatically. Always check current flow rates before heading out, as high flows can make wading difficult and impact fish behavior.
Regulations
This section of the river is strictly catch-and-release, with artificial flies and lures only. Be sure to follow these regulations to help maintain the quality of the fishery and preserve the healthy trout population.
Safety
The canyon’s steep, rocky terrain and fast currents make wading challenging, especially after water releases. Wear proper wading gear with good traction, and be cautious when navigating slippery rocks and deeper sections of the river, as access can be difficult.
COMMENTS
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