The South Platte River is Colorado's most technical trout fishery, with Gold Medal designated water at Deckers and Eleven Mile Canyon drawing serious fly fishers from across the country. Cold, clear releases from Cheesman and Spinney Mountain reservoirs sustain exceptional populations of large, highly selective brown and rainbow trout that have seen every pattern imaginable.
Winter midging from November through March is the South Platte's signature experience — midday Chironomid hatches on the Deckers stretch produce some of the year's best dry fly action in surprisingly mild canyon conditions. Spring and fall bring Blue-Winged Olive hatches that trigger aggressive surface feeding, while summer fishing peaks at dawn and dusk when fish move into riffles and shallow runs.
Brown trout are the defining species of the upper South Platte, reaching 18-22 inches in the canyon sections and known for the lock-jawed selectivity that has humbled generations of accomplished fly fishers. Rainbow trout are abundant throughout Eleven Mile Canyon and the lower Deckers stretch, equally educated and requiring precise dead-drift presentations on fine tippet to fool fish that see heavy angling pressure year-round.
Always check the current Colorado fishing regulations before heading out. Regulations on South Platte River may include special catch-and-release sections, artificial-only stretches, and seasonal closures. A valid Colorado fishing license is required.
Trout Bible pulls live flow and gauge data directly from the USGS National Water Information System. Current CFS (cubic feet per second) and gauge height readings are updated every 15–60 minutes, giving you the most accurate picture of conditions before you make the drive.